139257432 has 24 divisors (see below), whose sum is σ = 377155740. Its totient is φ = 46419120.

The previous prime is 139257431. The next prime is 139257439. The reversal of 139257432 is 234752931.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139257431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 966994 + ... + 967137.

Almost surely, 2^139257432 is an apocalyptic number.

139257432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

139257432 is an abundant number, since it is smaller than the sum of its proper divisors (237898308).

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

139257432 is a wasteful number, since it uses less digits than its factorization.

139257432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934143 (or 1934136 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 139257432 is about 11800.7386209508. The cubic root of 139257432 is about 518.3297394204.

The spelling of 139257432 in words is "one hundred thirty-nine million, two hundred fifty-seven thousand, four hundred thirty-two".