38779891 has 4 divisors (see below), whose sum is σ = 39725784. Its totient is φ = 37834000.

The previous prime is 38779883. The next prime is 38780017. The reversal of 38779891 is 19897783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19897783 = 23 ⋅865121.

It is a cyclic number.

It is not a de Polignac number, because 38779891 - 2³ = 38779883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38779291) 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, 472885 + ... + 472966.

It is an arithmetic number, because the mean of its divisors is an integer number (9931446).

Almost surely, 2^38779891 is an apocalyptic number.

38779891 is a deficient number, since it is larger than the sum of its proper divisors (945893).

38779891 is an equidigital number, since it uses as much as digits as its factorization.

38779891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 945892.

The product of its digits is 762048, while the sum is 52.

The square root of 38779891 is about 6227.3502390664. The cubic root of 38779891 is about 338.4819606863.

The spelling of 38779891 in words is "thirty-eight million, seven hundred seventy-nine thousand, eight hundred ninety-one".