123137402 has 4 divisors (see below), whose sum is σ = 184706106. Its totient is φ = 61568700.

The previous prime is 123137401. The next prime is 123137429. The reversal of 123137402 is 204731321.

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

It can be written as a sum of positive squares in only one way, i.e., 68244121 + 54893281 = 8261^2 + 7409^2 .

It is not an unprimeable number, because it can be changed into a prime (123137401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30784349 + ... + 30784352.

Almost surely, 2^123137402 is an apocalyptic number.

123137402 is a deficient number, since it is larger than the sum of its proper divisors (61568704).

123137402 is an equidigital number, since it uses as much as digits as its factorization.

123137402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61568703.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 123137402 is about 11096.7293379626. The cubic root of 123137402 is about 497.5040976742.

Adding to 123137402 its reverse (204731321), we get a palindrome (327868723).

The spelling of 123137402 in words is "one hundred twenty-three million, one hundred thirty-seven thousand, four hundred two".