440312013 has 6 divisors (see below), whose sum is σ = 636006254. Its totient is φ = 293541336.

The previous prime is 440312009. The next prime is 440312021. The reversal of 440312013 is 310213044.

It can be written as a sum of positive squares in only one way, i.e., 416282409 + 24029604 = 20403^2 + 4902^2 .

It is not a de Polignac number, because 440312013 - 2² = 440312009 is a prime.

It is a super-2 number, since 2×440312013² = 387749337584224338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (440212013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24461770 + ... + 24461787.

Almost surely, 2^440312013 is an apocalyptic number.

It is an amenable number.

440312013 is a deficient number, since it is larger than the sum of its proper divisors (195694241).

440312013 is a wasteful number, since it uses less digits than its factorization.

440312013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48923563 (or 48923560 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 440312013 is about 20983.6129634532. The cubic root of 440312013 is about 760.7702330981.

Adding to 440312013 its reverse (310213044), we get a palindrome (750525057).

The spelling of 440312013 in words is "four hundred forty million, three hundred twelve thousand, thirteen".