38999491 has 4 divisors (see below), whose sum is σ = 39064984. Its totient is φ = 38934000.

The previous prime is 38999489. The next prime is 38999497. The reversal of 38999491 is 19499983.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 38999491 - 2¹ = 38999489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38999497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31845 + ... + 33046.

It is an arithmetic number, because the mean of its divisors is an integer number (9766246).

Almost surely, 2^38999491 is an apocalyptic number.

38999491 is a deficient number, since it is larger than the sum of its proper divisors (65493).

38999491 is an equidigital number, since it uses as much as digits as its factorization.

38999491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65492.

The product of its digits is 629856, while the sum is 52.

The square root of 38999491 is about 6244.9572456503. The cubic root of 38999491 is about 339.1196689731.

The spelling of 38999491 in words is "thirty-eight million, nine hundred ninety-nine thousand, four hundred ninety-one".