138863381 has 16 divisors (see below), whose sum is σ = 148512000. Its totient is φ = 129470400.

The previous prime is 138863377. The next prime is 138863393. The reversal of 138863381 is 183368831.

It is a cyclic number.

It is not a de Polignac number, because 138863381 - 2² = 138863377 is a prime.

It is a super-2 number, since 2×138863381² = 38566077165502322, which contains 22 as substring.

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 (138863311) 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, 512276 + ... + 512546.

It is an arithmetic number, because the mean of its divisors is an integer number (9282000).

Almost surely, 2^138863381 is an apocalyptic number.

It is an amenable number.

138863381 is a deficient number, since it is larger than the sum of its proper divisors (9648619).

138863381 is a wasteful number, since it uses less digits than its factorization.

138863381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620.

The product of its digits is 82944, while the sum is 41.

The square root of 138863381 is about 11784.0307620101. The cubic root of 138863381 is about 517.8403788080.

The spelling of 138863381 in words is "one hundred thirty-eight million, eight hundred sixty-three thousand, three hundred eighty-one".