40640465 has 8 divisors (see below), whose sum is σ = 48807528. Its totient is φ = 32486400.

The previous prime is 40640447. The next prime is 40640497. The reversal of 40640465 is 56404604.

It can be written as a sum of positive squares in 4 ways, for example, as 3564544 + 37075921 = 1888^2 + 6089^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40640465 - 2¹⁰ = 40639441 is a prime.

It is a Duffinian 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, 6065 + ... + 10865.

It is an arithmetic number, because the mean of its divisors is an integer number (6100941).

Almost surely, 2^40640465 is an apocalyptic number.

It is an amenable number.

40640465 is a deficient number, since it is larger than the sum of its proper divisors (8167063).

40640465 is a wasteful number, since it uses less digits than its factorization.

40640465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6499.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 40640465 is about 6374.9874509680. The cubic root of 40640465 is about 343.8108326499.

The spelling of 40640465 in words is "forty million, six hundred forty thousand, four hundred sixty-five".