400353979 has 2 divisors, whose sum is σ = 400353980. Its totient is φ = 400353978.

The previous prime is 400353937. The next prime is 400354007. The reversal of 400353979 is 979353004.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400353979 - 2⁷ = 400353851 is a prime.

It is a super-2 number, since 2×400353979² = 320566617002264882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (400351979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200176989 + 200176990.

It is an arithmetic number, because the mean of its divisors is an integer number (200176990).

Almost surely, 2^400353979 is an apocalyptic number.

400353979 is a deficient number, since it is larger than the sum of its proper divisors (1).

400353979 is an equidigital number, since it uses as much as digits as its factorization.

400353979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 102060, while the sum is 40.

The square root of 400353979 is about 20008.8475180356. The cubic root of 400353979 is about 737.0235806109.

The spelling of 400353979 in words is "four hundred million, three hundred fifty-three thousand, nine hundred seventy-nine".