231738638 has 4 divisors (see below), whose sum is σ = 347607960. Its totient is φ = 115869318.

The previous prime is 231738629. The next prime is 231738667. The reversal of 231738638 is 836837132.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 231738595 and 231738604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57934658 + ... + 57934661.

It is an arithmetic number, because the mean of its divisors is an integer number (86901990).

Almost surely, 2^231738638 is an apocalyptic number.

231738638 is a deficient number, since it is larger than the sum of its proper divisors (115869322).

231738638 is a wasteful number, since it uses less digits than its factorization.

231738638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115869321.

The product of its digits is 145152, while the sum is 41.

The square root of 231738638 is about 15222.9641660223. The cubic root of 231738638 is about 614.2325350806.

The spelling of 231738638 in words is "two hundred thirty-one million, seven hundred thirty-eight thousand, six hundred thirty-eight".