139925438 has 4 divisors (see below), whose sum is σ = 209888160. Its totient is φ = 69962718.

The previous prime is 139925437. The next prime is 139925441. The reversal of 139925438 is 834529931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 834529931 = 37 ⋅22554863.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139925437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34981358 + ... + 34981361.

It is an arithmetic number, because the mean of its divisors is an integer number (52472040).

Almost surely, 2^139925438 is an apocalyptic number.

139925438 is a deficient number, since it is larger than the sum of its proper divisors (69962722).

139925438 is an equidigital number, since it uses as much as digits as its factorization.

139925438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69962721.

The product of its digits is 233280, while the sum is 44.

The square root of 139925438 is about 11829.0083269901. The cubic root of 139925438 is about 519.1572122094.

The spelling of 139925438 in words is "one hundred thirty-nine million, nine hundred twenty-five thousand, four hundred thirty-eight".