44639891 has 8 divisors (see below), whose sum is σ = 46126080. Its totient is φ = 43174152.

The previous prime is 44639887. The next prime is 44639899. The reversal of 44639891 is 19893644.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 44639891 - 2² = 44639887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (44639899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611 + ... + 9468.

It is an arithmetic number, because the mean of its divisors is an integer number (5765760).

Almost surely, 2^44639891 is an apocalyptic number.

44639891 is a deficient number, since it is larger than the sum of its proper divisors (1486189).

44639891 is a wasteful number, since it uses less digits than its factorization.

44639891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10225.

The product of its digits is 186624, while the sum is 44.

The square root of 44639891 is about 6681.3090783169. The cubic root of 44639891 is about 354.7379961912.

The spelling of 44639891 in words is "forty-four million, six hundred thirty-nine thousand, eight hundred ninety-one".