38299891 has 4 divisors (see below), whose sum is σ = 43771312. Its totient is φ = 32828472.

The previous prime is 38299871. The next prime is 38299903. The reversal of 38299891 is 19899283.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19899283 = 47 ⋅423389.

It is a cyclic number.

It is not a de Polignac number, because 38299891 - 2⁹ = 38299379 is a prime.

It is a super-2 number, since 2×38299891² = 2933763301223762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38299871) 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, 2735700 + ... + 2735713.

It is an arithmetic number, because the mean of its divisors is an integer number (10942828).

Almost surely, 2^38299891 is an apocalyptic number.

38299891 is a deficient number, since it is larger than the sum of its proper divisors (5471421).

38299891 is an equidigital number, since it uses as much as digits as its factorization.

38299891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5471420.

The product of its digits is 279936, while the sum is 49.

The square root of 38299891 is about 6188.6905723263. The cubic root of 38299891 is about 337.0796331989.

The spelling of 38299891 in words is "thirty-eight million, two hundred ninety-nine thousand, eight hundred ninety-one".