40307947 has 2 divisors, whose sum is σ = 40307948. Its totient is φ = 40307946.

The previous prime is 40307909. The next prime is 40307951. The reversal of 40307947 is 74970304.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40307947 - 2⁷ = 40307819 is a prime.

It is not a weakly prime, because it can be changed into another prime (40307957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20153973 + 20153974.

It is an arithmetic number, because the mean of its divisors is an integer number (20153974).

Almost surely, 2^40307947 is an apocalyptic number.

40307947 is a deficient number, since it is larger than the sum of its proper divisors (1).

40307947 is an equidigital number, since it uses as much as digits as its factorization.

40307947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 40307947 is about 6348.8539910759. The cubic root of 40307947 is about 342.8705833107.

The spelling of 40307947 in words is "forty million, three hundred seven thousand, nine hundred forty-seven".