40312913 has 4 divisors (see below), whose sum is σ = 41073588. Its totient is φ = 39552240.

The previous prime is 40312907. The next prime is 40312939. The reversal of 40312913 is 31921304.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35617024 + 4695889 = 5968^2 + 2167^2 .

It is a cyclic number.

It is not a de Polignac number, because 40312913 - 2⁴ = 40312897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40312313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380258 + ... + 380363.

It is an arithmetic number, because the mean of its divisors is an integer number (10268397).

Almost surely, 2^40312913 is an apocalyptic number.

It is an amenable number.

40312913 is a deficient number, since it is larger than the sum of its proper divisors (760675).

40312913 is an equidigital number, since it uses as much as digits as its factorization.

40312913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760674.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 40312913 is about 6349.2450732351. The cubic root of 40312913 is about 342.8846634572.

The spelling of 40312913 in words is "forty million, three hundred twelve thousand, nine hundred thirteen".