38402491 has 2 divisors, whose sum is σ = 38402492. Its totient is φ = 38402490.

The previous prime is 38402461. The next prime is 38402537. The reversal of 38402491 is 19420483.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 38402491 - 2¹¹ = 38400443 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38402461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19201245 + 19201246.

It is an arithmetic number, because the mean of its divisors is an integer number (19201246).

Almost surely, 2^38402491 is an apocalyptic number.

38402491 is a deficient number, since it is larger than the sum of its proper divisors (1).

38402491 is an equidigital number, since it uses as much as digits as its factorization.

38402491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 38402491 is about 6196.9743423706. The cubic root of 38402491 is about 337.3803610698.

The spelling of 38402491 in words is "thirty-eight million, four hundred two thousand, four hundred ninety-one".