40640451 has 8 divisors (see below), whose sum is σ = 54270480. Its totient is φ = 27052032.

The previous prime is 40640447. The next prime is 40640497. The reversal of 40640451 is 15404604.

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

It is not a de Polignac number, because 40640451 - 2² = 40640447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40640441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8046 + ... + 12083.

It is an arithmetic number, because the mean of its divisors is an integer number (6783810).

Almost surely, 2^40640451 is an apocalyptic number.

40640451 is a deficient number, since it is larger than the sum of its proper divisors (13630029).

40640451 is a wasteful number, since it uses less digits than its factorization.

40640451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20805.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 40640451 is about 6374.9863529266. The cubic root of 40640451 is about 343.8107931708.

The spelling of 40640451 in words is "forty million, six hundred forty thousand, four hundred fifty-one".