47991444 has 24 divisors (see below), whose sum is σ = 112113120. Its totient is φ = 15978144.

The previous prime is 47991421. The next prime is 47991469. The reversal of 47991444 is 44419974.

It is a junction number, because it is equal to n+sod(n) for n = 47991396 and 47991405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11287 + ... + 14945.

It is an arithmetic number, because the mean of its divisors is an integer number (4671380).

Almost surely, 2^47991444 is an apocalyptic number.

It is an amenable number.

47991444 is an abundant number, since it is smaller than the sum of its proper divisors (64121676).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

47991444 is a wasteful number, since it uses less digits than its factorization.

47991444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4759 (or 4757 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 47991444 is about 6927.5857266439. The cubic root of 47991444 is about 363.4025238336.

The spelling of 47991444 in words is "forty-seven million, nine hundred ninety-one thousand, four hundred forty-four".