38649591 has 48 divisors (see below), whose sum is σ = 63498240. Its totient is φ = 22524480.

The previous prime is 38649521. The next prime is 38649599. The reversal of 38649591 is 19594683.

It is a happy number.

It is not a de Polignac number, because 38649591 - 2¹⁰ = 38648567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38649599) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 121765 + ... + 122081.

It is an arithmetic number, because the mean of its divisors is an integer number (1322880).

Almost surely, 2^38649591 is an apocalyptic number.

38649591 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

38649591 is a deficient number, since it is larger than the sum of its proper divisors (24848649).

38649591 is a wasteful number, since it uses less digits than its factorization.

38649591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396 (or 393 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The square root of 38649591 is about 6216.8795227188. The cubic root of 38649591 is about 338.1024367690.

The spelling of 38649591 in words is "thirty-eight million, six hundred forty-nine thousand, five hundred ninety-one".