38642391 has 6 divisors (see below), whose sum is σ = 55816800. Its totient is φ = 25761588.

The previous prime is 38642381. The next prime is 38642419. The reversal of 38642391 is 19324683.

38642391 is a `hidden beast` number, since 3 + 8 + 642 + 3 + 9 + 1 = 666.

It is not a de Polignac number, because 38642391 - 2¹³ = 38634199 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38642311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2146791 + ... + 2146808.

It is an arithmetic number, because the mean of its divisors is an integer number (9302800).

Almost surely, 2^38642391 is an apocalyptic number.

38642391 is a deficient number, since it is larger than the sum of its proper divisors (17174409).

38642391 is a wasteful number, since it uses less digits than its factorization.

38642391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4293605 (or 4293602 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 38642391 is about 6216.3004271029. The cubic root of 38642391 is about 338.0814405251.

The spelling of 38642391 in words is "thirty-eight million, six hundred forty-two thousand, three hundred ninety-one".