38478091 has 2 divisors, whose sum is σ = 38478092. Its totient is φ = 38478090.

The previous prime is 38478067. The next prime is 38478107. The reversal of 38478091 is 19087483.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-38478091 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38478001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19239045 + 19239046.

It is an arithmetic number, because the mean of its divisors is an integer number (19239046).

Almost surely, 2^38478091 is an apocalyptic number.

38478091 is a deficient number, since it is larger than the sum of its proper divisors (1).

38478091 is an equidigital number, since it uses as much as digits as its factorization.

38478091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 38478091 is about 6203.0710942242. The cubic root of 38478091 is about 337.6016074501.

The spelling of 38478091 in words is "thirty-eight million, four hundred seventy-eight thousand, ninety-one".