1233861381 has 12 divisors (see below), whose sum is σ = 1859733408. Its totient is φ = 786810024.

The previous prime is 1233861373. The next prime is 1233861413. The reversal of 1233861381 is 1831683321.

1233861381 is a `hidden beast` number, since 1 + 2 + 3 + 38 + 613 + 8 + 1 = 666.

It is not a de Polignac number, because 1233861381 - 2³ = 1233861373 is a prime.

It is a super-2 number, since 2×1233861381² = 3044827815046454322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1233861341) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2980135 + ... + 2980548.

It is an arithmetic number, because the mean of its divisors is an integer number (154977784).

Almost surely, 2^1233861381 is an apocalyptic number.

It is an amenable number.

1233861381 is a deficient number, since it is larger than the sum of its proper divisors (625872027).

1233861381 is a wasteful number, since it uses less digits than its factorization.

1233861381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5960712 (or 5960709 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 1233861381 is about 35126.3630482861. The cubic root of 1233861381 is about 1072.5613025093.

The spelling of 1233861381 in words is "one billion, two hundred thirty-three million, eight hundred sixty-one thousand, three hundred eighty-one".