392735138 has 4 divisors (see below), whose sum is σ = 589102710. Its totient is φ = 196367568.

The previous prime is 392735137. The next prime is 392735153. The reversal of 392735138 is 831537293.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831537293 = 12829 ⋅64817.

It can be written as a sum of positive squares in only one way, i.e., 371602729 + 21132409 = 19277^2 + 4597^2 .

It is a junction number, because it is equal to n+sod(n) for n = 392735095 and 392735104.

It is not an unprimeable number, because it can be changed into a prime (392735137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98183783 + ... + 98183786.

Almost surely, 2^392735138 is an apocalyptic number.

392735138 is a deficient number, since it is larger than the sum of its proper divisors (196367572).

392735138 is a wasteful number, since it uses less digits than its factorization.

392735138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196367571.

The product of its digits is 136080, while the sum is 41.

The square root of 392735138 is about 19817.5462154122. The cubic root of 392735138 is about 732.3183554070.

The spelling of 392735138 in words is "three hundred ninety-two million, seven hundred thirty-five thousand, one hundred thirty-eight".