38031890 has 32 divisors (see below), whose sum is σ = 78064560. Its totient is φ = 13215744.

The previous prime is 38031859. The next prime is 38031911. The reversal of 38031890 is 9813083.

It is a Cunningham number, because it is equal to 6167²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 13697401 + 24334489 = 3701^2 + 4933^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6395 + ... + 10814.

Almost surely, 2^38031890 is an apocalyptic number.

38031890 is an abundant number, since it is smaller than the sum of its proper divisors (40032670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

38031890 is a wasteful number, since it uses less digits than its factorization.

38031890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17246.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 38031890 is about 6167.0000810767. Note that the first 4 decimals coincide. The cubic root of 38031890 is about 336.2915612221.

The spelling of 38031890 in words is "thirty-eight million, thirty-one thousand, eight hundred ninety".