13623381 has 12 divisors (see below), whose sum is σ = 19731660. Its totient is φ = 9057600.

The previous prime is 13623367. The next prime is 13623391. The reversal of 13623381 is 18332631.

It is a happy number.

13623381 is a `hidden beast` number, since 1 + 3 + 623 + 38 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9400356 + 4223025 = 3066^2 + 2055^2 .

It is not a de Polignac number, because 13623381 - 2¹⁴ = 13606997 is a prime.

It is a super-2 number, since 2×13623381² = 371193019742322, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13623331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1831 + ... + 5531.

It is an arithmetic number, because the mean of its divisors is an integer number (1644305).

Almost surely, 2^13623381 is an apocalyptic number.

It is an amenable number.

13623381 is a deficient number, since it is larger than the sum of its proper divisors (6108279).

13623381 is a wasteful number, since it uses less digits than its factorization.

13623381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4116 (or 4113 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 13623381 is about 3690.9864535108. The cubic root of 13623381 is about 238.8333484566.

The spelling of 13623381 in words is "thirteen million, six hundred twenty-three thousand, three hundred eighty-one".