612391923 has 48 divisors (see below), whose sum is σ = 1049158656. Its totient is φ = 339318720.

The previous prime is 612391909. The next prime is 612391933. The reversal of 612391923 is 329193216.

It is a happy number.

612391923 is a `hidden beast` number, since 612 + 3 + 9 + 19 + 23 = 666.

It is not a de Polignac number, because 612391923 - 2⁸ = 612391667 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (612391903) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 135486 + ... + 139932.

It is an arithmetic number, because the mean of its divisors is an integer number (21857472).

Almost surely, 2^612391923 is an apocalyptic number.

612391923 is a deficient number, since it is larger than the sum of its proper divisors (436766733).

612391923 is a wasteful number, since it uses less digits than its factorization.

612391923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4584 (or 4581 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 612391923 is about 24746.5537600693. The cubic root of 612391923 is about 849.1996725150.

The spelling of 612391923 in words is "six hundred twelve million, three hundred ninety-one thousand, nine hundred twenty-three".