123812381 has 16 divisors (see below), whose sum is σ = 161077248. Its totient is φ = 92281200.

The previous prime is 123812347. The next prime is 123812387. The reversal of 123812381 is 183218321.

It is a de Polignac number, because none of the positive numbers 2^k-123812381 is a prime.

It is a super-2 number, since 2×123812381² = 30659011377778322, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123812387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33185 + ... + 36726.

It is an arithmetic number, because the mean of its divisors is an integer number (10067328).

Almost surely, 2^123812381 is an apocalyptic number.

123812381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123812381 is a deficient number, since it is larger than the sum of its proper divisors (37264867).

123812381 is a wasteful number, since it uses less digits than its factorization.

123812381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69952.

The product of its digits is 2304, while the sum is 29.

The square root of 123812381 is about 11127.1011948306. The cubic root of 123812381 is about 498.4114664672.

The spelling of 123812381 in words is "one hundred twenty-three million, eight hundred twelve thousand, three hundred eighty-one".