400369979 has 2 divisors, whose sum is σ = 400369980. Its totient is φ = 400369978.

The previous prime is 400369967. The next prime is 400369997. The reversal of 400369979 is 979963004.

Together with next prime (400369997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400369979 is a prime.

It is a super-2 number, since 2×400369979² = 320592240168920882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400369909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200184989 + 200184990.

It is an arithmetic number, because the mean of its divisors is an integer number (200184990).

Almost surely, 2^400369979 is an apocalyptic number.

400369979 is a deficient number, since it is larger than the sum of its proper divisors (1).

400369979 is an equidigital number, since it uses as much as digits as its factorization.

400369979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 47.

The square root of 400369979 is about 20009.2473371689. The cubic root of 400369979 is about 737.0333987725.

The spelling of 400369979 in words is "four hundred million, three hundred sixty-nine thousand, nine hundred seventy-nine".