38390491 has 2 divisors, whose sum is σ = 38390492. Its totient is φ = 38390490.

The previous prime is 38390477. The next prime is 38390503. The reversal of 38390491 is 19409383.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 38390491 - 2⁵ = 38390459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 38390491.

It is not a weakly prime, because it can be changed into another prime (38390441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19195245 + 19195246.

It is an arithmetic number, because the mean of its divisors is an integer number (19195246).

Almost surely, 2^38390491 is an apocalyptic number.

38390491 is a deficient number, since it is larger than the sum of its proper divisors (1).

38390491 is an equidigital number, since it uses as much as digits as its factorization.

38390491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 38390491 is about 6196.0060522888. The cubic root of 38390491 is about 337.3452159008.

The spelling of 38390491 in words is "thirty-eight million, three hundred ninety thousand, four hundred ninety-one".