139749930 has 48 divisors (see below), whose sum is σ = 364425984. Its totient is φ = 37156320.

The previous prime is 139749899. The next prime is 139749971. The reversal of 139749930 is 39947931.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30915 + ... + 35145.

It is an arithmetic number, because the mean of its divisors is an integer number (7592208).

Almost surely, 2^139749930 is an apocalyptic number.

139749930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

139749930 is an abundant number, since it is smaller than the sum of its proper divisors (224676054).

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

139749930 is a wasteful number, since it uses less digits than its factorization.

139749930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4611 (or 4608 counting only the distinct ones).

The product of its (nonzero) digits is 183708, while the sum is 45.

The square root of 139749930 is about 11821.5874568520. The cubic root of 139749930 is about 518.9400623533.

The spelling of 139749930 in words is "one hundred thirty-nine million, seven hundred forty-nine thousand, nine hundred thirty".