440055981 has 12 divisors (see below), whose sum is σ = 637684320. Its totient is φ = 292425480.

The previous prime is 440055977. The next prime is 440055989. The reversal of 440055981 is 189550044.

It is not a de Polignac number, because 440055981 - 2² = 440055977 is a prime.

It is a super-2 number, since 2×440055981² = 387298532827744722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) 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 (440055989) 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, 75811 + ... + 81408.

It is an arithmetic number, because the mean of its divisors is an integer number (53140360).

Almost surely, 2^440055981 is an apocalyptic number.

It is an amenable number.

440055981 is a deficient number, since it is larger than the sum of its proper divisors (197628339).

440055981 is a wasteful number, since it uses less digits than its factorization.

440055981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157536 (or 157533 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 440055981 is about 20977.5113156923. The cubic root of 440055981 is about 760.6227473119.

The spelling of 440055981 in words is "four hundred forty million, fifty-five thousand, nine hundred eighty-one".