123439816 has 8 divisors (see below), whose sum is σ = 231449670. Its totient is φ = 61719904.

The previous prime is 123439793. The next prime is 123439829. The reversal of 123439816 is 618934321.

It can be written as a sum of positive squares in only one way, i.e., 122544900 + 894916 = 11070^2 + 946^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×123439816² = 30474776348227712, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7714981 + ... + 7714996.

Almost surely, 2^123439816 is an apocalyptic number.

It is an amenable number.

123439816 is a deficient number, since it is larger than the sum of its proper divisors (108009854).

123439816 is a wasteful number, since it uses less digits than its factorization.

123439816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15429983 (or 15429979 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 123439816 is about 11110.3472492987. The cubic root of 123439816 is about 497.9110393074.

The spelling of 123439816 in words is "one hundred twenty-three million, four hundred thirty-nine thousand, eight hundred sixteen".