400156793 has 2 divisors, whose sum is σ = 400156794. Its totient is φ = 400156792.

The previous prime is 400156787. The next prime is 400156811. The reversal of 400156793 is 397651004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215414329 + 184742464 = 14677^2 + 13592^2 .

It is a cyclic number.

It is not a de Polignac number, because 400156793 - 2¹⁴ = 400140409 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (400155793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200078396 + 200078397.

It is an arithmetic number, because the mean of its divisors is an integer number (200078397).

Almost surely, 2^400156793 is an apocalyptic number.

It is an amenable number.

400156793 is a deficient number, since it is larger than the sum of its proper divisors (1).

400156793 is an equidigital number, since it uses as much as digits as its factorization.

400156793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 400156793 is about 20003.9194409496. The cubic root of 400156793 is about 736.9025588770.

The spelling of 400156793 in words is "four hundred million, one hundred fifty-six thousand, seven hundred ninety-three".