40297913 has 4 divisors (see below), whose sum is σ = 40319460. Its totient is φ = 40276368.

The previous prime is 40297903. The next prime is 40297919. The reversal of 40297913 is 31979204.

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 16949689 + 23348224 = 4117^2 + 4832^2 .

It is a cyclic number.

It is not a de Polignac number, because 40297913 - 2⁸ = 40297657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40297919) 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, 7670 + ... + 11807.

It is an arithmetic number, because the mean of its divisors is an integer number (10079865).

Almost surely, 2^40297913 is an apocalyptic number.

It is an amenable number.

40297913 is a deficient number, since it is larger than the sum of its proper divisors (21547).

40297913 is a wasteful number, since it uses less digits than its factorization.

40297913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21546.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 40297913 is about 6348.0637205372. The cubic root of 40297913 is about 342.8421302868.

The spelling of 40297913 in words is "forty million, two hundred ninety-seven thousand, nine hundred thirteen".