43938491 has 4 divisors (see below), whose sum is σ = 44218512. Its totient is φ = 43658472.

The previous prime is 43938473. The next prime is 43938493. The reversal of 43938491 is 19483934.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43938491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43938493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139775 + ... + 140088.

It is an arithmetic number, because the mean of its divisors is an integer number (11054628).

Almost surely, 2^43938491 is an apocalyptic number.

43938491 is a deficient number, since it is larger than the sum of its proper divisors (280021).

43938491 is a wasteful number, since it uses less digits than its factorization.

43938491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280020.

The product of its digits is 93312, while the sum is 41.

The square root of 43938491 is about 6628.6115439057. The cubic root of 43938491 is about 352.8702506080.

The spelling of 43938491 in words is "forty-three million, nine hundred thirty-eight thousand, four hundred ninety-one".