40668451 has 4 divisors (see below), whose sum is σ = 40826952. Its totient is φ = 40509952.

The previous prime is 40668443. The next prime is 40668457. The reversal of 40668451 is 15486604.

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

It is a cyclic number.

It is not a de Polignac number, because 40668451 - 2³ = 40668443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40668457) 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, 78865 + ... + 79378.

It is an arithmetic number, because the mean of its divisors is an integer number (10206738).

Almost surely, 2^40668451 is an apocalyptic number.

40668451 is a deficient number, since it is larger than the sum of its proper divisors (158501).

40668451 is a wasteful number, since it uses less digits than its factorization.

40668451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158500.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 40668451 is about 6377.1820579312. The cubic root of 40668451 is about 343.8897333399.

The spelling of 40668451 in words is "forty million, six hundred sixty-eight thousand, four hundred fifty-one".