123521994 has 12 divisors (see below), whose sum is σ = 267631026. Its totient is φ = 41173992.

The previous prime is 123521989. The next prime is 123521999. The reversal of 123521994 is 499125321.

123521994 is a `hidden beast` number, since 123 + 521 + 9 + 9 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (123521989) and next prime (123521999).

It can be written as a sum of positive squares in only one way, i.e., 118526769 + 4995225 = 10887^2 + 2235^2 .

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 (123521999) 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, 3431149 + ... + 3431184.

Almost surely, 2^123521994 is an apocalyptic number.

123521994 is an abundant number, since it is smaller than the sum of its proper divisors (144109032).

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

123521994 is a wasteful number, since it uses less digits than its factorization.

123521994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6862341 (or 6862338 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 123521994 is about 11114.0448982357. The cubic root of 123521994 is about 498.0215067888.

The spelling of 123521994 in words is "one hundred twenty-three million, five hundred twenty-one thousand, nine hundred ninety-four".