38091399 has 4 divisors (see below), whose sum is σ = 50788536. Its totient is φ = 25394264.

The previous prime is 38091367. The next prime is 38091433. The reversal of 38091399 is 99319083.

It is a happy number.

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 38091399 - 2⁵ = 38091367 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38091399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38091499) 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, 6348564 + ... + 6348569.

It is an arithmetic number, because the mean of its divisors is an integer number (12697134).

Almost surely, 2^38091399 is an apocalyptic number.

38091399 is a deficient number, since it is larger than the sum of its proper divisors (12697137).

38091399 is a wasteful number, since it uses less digits than its factorization.

38091399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12697136.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 38091399 is about 6171.8229883884. The cubic root of 38091399 is about 336.4668697654.

The spelling of 38091399 in words is "thirty-eight million, ninety-one thousand, three hundred ninety-nine".