38691979 has 2 divisors, whose sum is σ = 38691980. Its totient is φ = 38691978.

The previous prime is 38691967. The next prime is 38691997. The reversal of 38691979 is 97919683.

Together with next prime (38691997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 38691979 - 2¹⁵ = 38659211 is a prime.

It is not a weakly prime, because it can be changed into another prime (38691929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19345989 + 19345990.

It is an arithmetic number, because the mean of its divisors is an integer number (19345990).

Almost surely, 2^38691979 is an apocalyptic number.

38691979 is a deficient number, since it is larger than the sum of its proper divisors (1).

38691979 is an equidigital number, since it uses as much as digits as its factorization.

38691979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 52.

The square root of 38691979 is about 6220.2876943113. The cubic root of 38691979 is about 338.2259934887.

The spelling of 38691979 in words is "thirty-eight million, six hundred ninety-one thousand, nine hundred seventy-nine".