400020407 has 2 divisors, whose sum is σ = 400020408. Its totient is φ = 400020406.

The previous prime is 400020391. The next prime is 400020427. The reversal of 400020407 is 704020004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400020407 - 2⁴ = 400020391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400020427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200010203 + 200010204.

It is an arithmetic number, because the mean of its divisors is an integer number (200010204).

Almost surely, 2^400020407 is an apocalyptic number.

400020407 is a deficient number, since it is larger than the sum of its proper divisors (1).

400020407 is an equidigital number, since it uses as much as digits as its factorization.

400020407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 17.

The square root of 400020407 is about 20000.5101684932. The cubic root of 400020407 is about 736.8188295201.

The spelling of 400020407 in words is "four hundred million, twenty thousand, four hundred seven".