40815427 has 2 divisors, whose sum is σ = 40815428. Its totient is φ = 40815426.

The previous prime is 40815407. The next prime is 40815449. The reversal of 40815427 is 72451804.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40815427 is a prime.

It is not a weakly prime, because it can be changed into another prime (40815407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20407713 + 20407714.

It is an arithmetic number, because the mean of its divisors is an integer number (20407714).

Almost surely, 2^40815427 is an apocalyptic number.

40815427 is a deficient number, since it is larger than the sum of its proper divisors (1).

40815427 is an equidigital number, since it uses as much as digits as its factorization.

40815427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 40815427 is about 6388.6952502056. The cubic root of 40815427 is about 344.3035083912.

The spelling of 40815427 in words is "forty million, eight hundred fifteen thousand, four hundred twenty-seven".