400205479 has 2 divisors, whose sum is σ = 400205480. Its totient is φ = 400205478.

The previous prime is 400205471. The next prime is 400205549. The reversal of 400205479 is 974502004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400205479 - 2³ = 400205471 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400205479.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400205471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200102739 + 200102740.

It is an arithmetic number, because the mean of its divisors is an integer number (200102740).

Almost surely, 2^400205479 is an apocalyptic number.

400205479 is a deficient number, since it is larger than the sum of its proper divisors (1).

400205479 is an equidigital number, since it uses as much as digits as its factorization.

400205479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 400205479 is about 20005.1363154566. The cubic root of 400205479 is about 736.9324433154.

The spelling of 400205479 in words is "four hundred million, two hundred five thousand, four hundred seventy-nine".