400569947 has 2 divisors, whose sum is σ = 400569948. Its totient is φ = 400569946.

The previous prime is 400569943. The next prime is 400569991. The reversal of 400569947 is 749965004.

It is an a-pointer prime, because the next prime (400569991) can be obtained adding 400569947 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400569947 - 2² = 400569943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 400569898 and 400569907.

It is not a weakly prime, because it can be changed into another prime (400569943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200284973 + 200284974.

It is an arithmetic number, because the mean of its divisors is an integer number (200284974).

Almost surely, 2^400569947 is an apocalyptic number.

400569947 is a deficient number, since it is larger than the sum of its proper divisors (1).

400569947 is an equidigital number, since it uses as much as digits as its factorization.

400569947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 400569947 is about 20014.2436029943. The cubic root of 400569947 is about 737.1560840986.

The spelling of 400569947 in words is "four hundred million, five hundred sixty-nine thousand, nine hundred forty-seven".