38949921 has 12 divisors (see below), whose sum is σ = 56345172. Its totient is φ = 25927776.

The previous prime is 38949917. The next prime is 38949947. The reversal of 38949921 is 12994983.

It can be written as a sum of positive squares in 2 ways, for example, as 23386896 + 15563025 = 4836^2 + 3945^2 .

It is not a de Polignac number, because 38949921 - 2² = 38949917 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38949721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3955 + ... + 9671.

It is an arithmetic number, because the mean of its divisors is an integer number (4695431).

Almost surely, 2^38949921 is an apocalyptic number.

It is an amenable number.

38949921 is a deficient number, since it is larger than the sum of its proper divisors (17395251).

38949921 is a wasteful number, since it uses less digits than its factorization.

38949921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6480 (or 6477 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 38949921 is about 6240.9871815283. The cubic root of 38949921 is about 338.9759295829.

The spelling of 38949921 in words is "thirty-eight million, nine hundred forty-nine thousand, nine hundred twenty-one".