400070057 has 2 divisors, whose sum is σ = 400070058. Its totient is φ = 400070056.

The previous prime is 400070039. The next prime is 400070107. The reversal of 400070057 is 750070004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396368281 + 3701776 = 19909^2 + 1924^2 .

It is a cyclic number.

It is not a de Polignac number, because 400070057 - 2¹⁸ = 399807913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400070017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200035028 + 200035029.

It is an arithmetic number, because the mean of its divisors is an integer number (200035029).

Almost surely, 2^400070057 is an apocalyptic number.

It is an amenable number.

400070057 is a deficient number, since it is larger than the sum of its proper divisors (1).

400070057 is an equidigital number, since it uses as much as digits as its factorization.

400070057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 980, while the sum is 23.

The square root of 400070057 is about 20001.7513483195. The cubic root of 400070057 is about 736.8493125828.

The spelling of 400070057 in words is "four hundred million, seventy thousand, fifty-seven".