38991211 has 32 divisors (see below), whose sum is σ = 49664000. Its totient is φ = 30481920.

The previous prime is 38991193. The next prime is 38991221. The reversal of 38991211 is 11219983.

It is not a de Polignac number, because 38991211 - 2⁵ = 38991179 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38991221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 201931 + ... + 202123.

It is an arithmetic number, because the mean of its divisors is an integer number (1552000).

Almost surely, 2^38991211 is an apocalyptic number.

38991211 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

38991211 is a deficient number, since it is larger than the sum of its proper divisors (10672789).

38991211 is a wasteful number, since it uses less digits than its factorization.

38991211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264 (or 250 counting only the distinct ones).

The product of its digits is 3888, while the sum is 34.

The square root of 38991211 is about 6244.2942755767. The cubic root of 38991211 is about 339.0956677231.

The spelling of 38991211 in words is "thirty-eight million, nine hundred ninety-one thousand, two hundred eleven".