1238144564 has 12 divisors (see below), whose sum is σ = 2194180800. Its totient is φ = 611235768.

The previous prime is 1238144549. The next prime is 1238144591. The reversal of 1238144564 is 4654418321.

It is a happy number.

It is a super-2 number, since 2×1238144564² = 3066003922725500192, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1958774 + ... + 1959405.

It is an arithmetic number, because the mean of its divisors is an integer number (182848400).

Almost surely, 2^1238144564 is an apocalyptic number.

It is an amenable number.

1238144564 is a deficient number, since it is larger than the sum of its proper divisors (956036236).

1238144564 is a wasteful number, since it uses less digits than its factorization.

1238144564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3918262 (or 3918260 counting only the distinct ones).

The product of its digits is 92160, while the sum is 38.

The square root of 1238144564 is about 35187.2784397998. The cubic root of 1238144564 is about 1073.8009530478.

The spelling of 1238144564 in words is "one billion, two hundred thirty-eight million, one hundred forty-four thousand, five hundred sixty-four".