400406477 has 2 divisors, whose sum is σ = 400406478. Its totient is φ = 400406476.

The previous prime is 400406473. The next prime is 400406483. The reversal of 400406477 is 774604004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 271788196 + 128618281 = 16486^2 + 11341^2 .

It is a cyclic number.

It is not a de Polignac number, because 400406477 - 2² = 400406473 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400406473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200203238 + 200203239.

It is an arithmetic number, because the mean of its divisors is an integer number (200203239).

Almost surely, 2^400406477 is an apocalyptic number.

It is an amenable number.

400406477 is a deficient number, since it is larger than the sum of its proper divisors (1).

400406477 is an equidigital number, since it uses as much as digits as its factorization.

400406477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 32.

The square root of 400406477 is about 20010.1593446929. The cubic root of 400406477 is about 737.0557942476.

The spelling of 400406477 in words is "four hundred million, four hundred six thousand, four hundred seventy-seven".