139474940 has 48 divisors (see below), whose sum is σ = 322739424. Its totient is φ = 50208000.

The previous prime is 139474939. The next prime is 139474957. The reversal of 139474940 is 49474931.

139474940 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19082 + ... + 25358.

It is an arithmetic number, because the mean of its divisors is an integer number (6723738).

Almost surely, 2^139474940 is an apocalyptic number.

139474940 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 139474940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161369712).

139474940 is an abundant number, since it is smaller than the sum of its proper divisors (183264484).

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

139474940 is a wasteful number, since it uses less digits than its factorization.

139474940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6398 (or 6396 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 139474940 is about 11809.9508889749. The cubic root of 139474940 is about 518.5994610361.

Subtracting from 139474940 its reverse (49474931), we obtain a palindrome (90000009).

The spelling of 139474940 in words is "one hundred thirty-nine million, four hundred seventy-four thousand, nine hundred forty".