123621994 has 16 divisors (see below), whose sum is σ = 197485128. Its totient is φ = 57836032.

The previous prime is 123621991. The next prime is 123621997. The reversal of 123621994 is 499126321.

It is an interprime number because it is at equal distance from previous prime (123621991) and next prime (123621997).

It can be written as a sum of positive squares in 4 ways, for example, as 106357969 + 17264025 = 10313^2 + 4155^2 .

It is not an unprimeable number, because it can be changed into a prime (123621991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4627 + ... + 16390.

Almost surely, 2^123621994 is an apocalyptic number.

123621994 is a deficient number, since it is larger than the sum of its proper divisors (73863134).

123621994 is a wasteful number, since it uses less digits than its factorization.

123621994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21209.

The product of its digits is 23328, while the sum is 37.

The square root of 123621994 is about 11118.5428002054. The cubic root of 123621994 is about 498.1558653637.

The spelling of 123621994 in words is "one hundred twenty-three million, six hundred twenty-one thousand, nine hundred ninety-four".