44405991 has 12 divisors (see below), whose sum is σ = 73305232. Its totient is φ = 25374816.

The previous prime is 44405969. The next prime is 44406001. The reversal of 44405991 is 19950444.

It is a happy number.

It is not a de Polignac number, because 44405991 - 2¹⁰ = 44404967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44405941) 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, 352366 + ... + 352491.

Almost surely, 2^44405991 is an apocalyptic number.

44405991 is a deficient number, since it is larger than the sum of its proper divisors (28899241).

44405991 is a wasteful number, since it uses less digits than its factorization.

44405991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704870 (or 704867 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 44405991 is about 6663.7820342505. The cubic root of 44405991 is about 354.1173363788.

The spelling of 44405991 in words is "forty-four million, four hundred five thousand, nine hundred ninety-one".