139748840 has 192 divisors, whose sum is σ = 419091840. Its totient is φ = 40734720.

The previous prime is 139748831. The next prime is 139748879. The reversal of 139748840 is 48847931.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 139748791 and 139748800.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 890042 + ... + 890198.

It is an arithmetic number, because the mean of its divisors is an integer number (2182770).

Almost surely, 2^139748840 is an apocalyptic number.

139748840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139748840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (209545920).

139748840 is an abundant number, since it is smaller than the sum of its proper divisors (279343000).

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

139748840 is a wasteful number, since it uses less digits than its factorization.

139748840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 139748840 is about 11821.5413546627. The cubic root of 139748840 is about 518.9387131669.

Subtracting from 139748840 its reverse (48847931), we obtain a palindrome (90900909).

The spelling of 139748840 in words is "one hundred thirty-nine million, seven hundred forty-eight thousand, eight hundred forty".