123687994 has 4 divisors (see below), whose sum is σ = 185531994. Its totient is φ = 61843996.

The previous prime is 123687983. The next prime is 123688027. The reversal of 123687994 is 499786321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 499786321 = 317 ⋅1576613.

It can be written as a sum of positive squares in only one way, i.e., 123498769 + 189225 = 11113^2 + 435^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30921997 + ... + 30922000.

Almost surely, 2^123687994 is an apocalyptic number.

123687994 is a deficient number, since it is larger than the sum of its proper divisors (61844000).

123687994 is an equidigital number, since it uses as much as digits as its factorization.

123687994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61843999.

The product of its digits is 653184, while the sum is 49.

The square root of 123687994 is about 11121.5104190033. The cubic root of 123687994 is about 498.2445023360.

The spelling of 123687994 in words is "one hundred twenty-three million, six hundred eighty-seven thousand, nine hundred ninety-four".