40215451 has 4 divisors (see below), whose sum is σ = 40667400. Its totient is φ = 39763504.

The previous prime is 40215433. The next prime is 40215467. The reversal of 40215451 is 15451204.

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 40215451 - 2¹⁷ = 40084379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40245451) 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, 225841 + ... + 226018.

It is an arithmetic number, because the mean of its divisors is an integer number (10166850).

Almost surely, 2^40215451 is an apocalyptic number.

40215451 is a deficient number, since it is larger than the sum of its proper divisors (451949).

40215451 is an equidigital number, since it uses as much as digits as its factorization.

40215451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451948.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 40215451 is about 6341.5653430364. The cubic root of 40215451 is about 342.6081168964.

Adding to 40215451 its reverse (15451204), we get a palindrome (55666655).

The spelling of 40215451 in words is "forty million, two hundred fifteen thousand, four hundred fifty-one".