38355681 has 24 divisors (see below), whose sum is σ = 64069824. Its totient is φ = 20230560.

The previous prime is 38355673. The next prime is 38355701. The reversal of 38355681 is 18655383.

It is not a de Polignac number, because 38355681 - 2³ = 38355673 is a prime.

It is a super-2 number, since 2×38355681² = 2942316529947522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (38355631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8125 + ... + 11946.

It is an arithmetic number, because the mean of its divisors is an integer number (2669576).

Almost surely, 2^38355681 is an apocalyptic number.

It is an amenable number.

38355681 is a deficient number, since it is larger than the sum of its proper divisors (25714143).

38355681 is a wasteful number, since it uses less digits than its factorization.

38355681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20101 (or 20094 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The square root of 38355681 is about 6193.1963476060. The cubic root of 38355681 is about 337.2432241688.

The spelling of 38355681 in words is "thirty-eight million, three hundred fifty-five thousand, six hundred eighty-one".