139749750 has 192 divisors, whose sum is σ = 455569920. Its totient is φ = 30196800.

The previous prime is 139749749. The next prime is 139749751. The reversal of 139749750 is 57947931.

It is an interprime number because it is at equal distance from previous prime (139749749) and next prime (139749751).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 139749696 and 139749705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139749751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 299017 + ... + 299483.

It is an arithmetic number, because the mean of its divisors is an integer number (2372760).

Almost surely, 2^139749750 is an apocalyptic number.

139749750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 139749750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227784960).

139749750 is an abundant number, since it is smaller than the sum of its proper divisors (315820170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139749750 is a wasteful number, since it uses less digits than its factorization.

139749750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The square root of 139749750 is about 11821.5798436588. The cubic root of 139749750 is about 518.9398395524.

The spelling of 139749750 in words is "one hundred thirty-nine million, seven hundred forty-nine thousand, seven hundred fifty".