38609991 has 36 divisors (see below), whose sum is σ = 67134600. Its totient is φ = 21295008.

The previous prime is 38609971. The next prime is 38609993. The reversal of 38609991 is 19990683.

38609991 is a `hidden beast` number, since 38 + 609 + 9 + 9 + 1 = 666.

It is not a de Polignac number, because 38609991 - 2¹³ = 38601799 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38609993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11280 + ... + 14298.

It is an arithmetic number, because the mean of its divisors is an integer number (1864850).

Almost surely, 2^38609991 is an apocalyptic number.

38609991 is a deficient number, since it is larger than the sum of its proper divisors (28524609).

38609991 is a wasteful number, since it uses less digits than its factorization.

38609991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3068 (or 3058 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 38609991 is about 6213.6938289555. The cubic root of 38609991 is about 337.9869251388.

The spelling of 38609991 in words is "thirty-eight million, six hundred nine thousand, nine hundred ninety-one".