40013947 has 2 divisors, whose sum is σ = 40013948. Its totient is φ = 40013946.

The previous prime is 40013917. The next prime is 40013957. The reversal of 40013947 is 74931004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40013947 is a prime.

It is a super-2 number, since 2×40013947² = 3202231909037618, which contains 22 as substring.

40013947 is a modest number, since divided by 13947 gives 4 as remainder.

It is not a weakly prime, because it can be changed into another prime (40013917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20006973 + 20006974.

It is an arithmetic number, because the mean of its divisors is an integer number (20006974).

Almost surely, 2^40013947 is an apocalyptic number.

40013947 is a deficient number, since it is larger than the sum of its proper divisors (1).

40013947 is an equidigital number, since it uses as much as digits as its factorization.

40013947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 40013947 is about 6325.6578314038. The cubic root of 40013947 is about 342.0349331074.

The spelling of 40013947 in words is "forty million, thirteen thousand, nine hundred forty-seven".