38423691 has 18 divisors (see below), whose sum is σ = 56652180. Its totient is φ = 25088016.

The previous prime is 38423687. The next prime is 38423711. The reversal of 38423691 is 19632483.

It is not a de Polignac number, because 38423691 - 2² = 38423687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (38423591) 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 17 ways as a sum of consecutive naturals, for example, 142705 + ... + 142973.

Almost surely, 2^38423691 is an apocalyptic number.

38423691 is a deficient number, since it is larger than the sum of its proper divisors (18228489).

38423691 is an equidigital number, since it uses as much as digits as its factorization.

38423691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603 (or 331 counting only the distinct ones).

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

The square root of 38423691 is about 6198.6846185300. The cubic root of 38423691 is about 337.4424329798.

The spelling of 38423691 in words is "thirty-eight million, four hundred twenty-three thousand, six hundred ninety-one".