938870991 has 24 divisors (see below), whose sum is σ = 1426329216. Its totient is φ = 594285120.

The previous prime is 938870983. The next prime is 938871029. The reversal of 938870991 is 199078839.

It is not a de Polignac number, because 938870991 - 2³ = 938870983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (938874991) 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, 16960 + ... + 46533.

It is an arithmetic number, because the mean of its divisors is an integer number (59430384).

Almost surely, 2^938870991 is an apocalyptic number.

938870991 is a deficient number, since it is larger than the sum of its proper divisors (487458225).

938870991 is a wasteful number, since it uses less digits than its factorization.

938870991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63583 (or 63580 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The square root of 938870991 is about 30641.0017949805. The cubic root of 938870991 is about 979.1937666556.

The spelling of 938870991 in words is "nine hundred thirty-eight million, eight hundred seventy thousand, nine hundred ninety-one".