40440947 has 2 divisors, whose sum is σ = 40440948. Its totient is φ = 40440946.

The previous prime is 40440929. The next prime is 40441007. The reversal of 40440947 is 74904404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40440947 - 2¹⁴ = 40424563 is a prime.

It is not a weakly prime, because it can be changed into another prime (40440347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20220473 + 20220474.

It is an arithmetic number, because the mean of its divisors is an integer number (20220474).

Almost surely, 2^40440947 is an apocalyptic number.

40440947 is a deficient number, since it is larger than the sum of its proper divisors (1).

40440947 is an equidigital number, since it uses as much as digits as its factorization.

40440947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 40440947 is about 6359.3196963197. The cubic root of 40440947 is about 343.2472809338.

The spelling of 40440947 in words is "forty million, four hundred forty thousand, nine hundred forty-seven".