400424407 has 2 divisors, whose sum is σ = 400424408. Its totient is φ = 400424406.

The previous prime is 400424393. The next prime is 400424441. The reversal of 400424407 is 704424004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400424407 - 2⁷ = 400424279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400424447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200212203 + 200212204.

It is an arithmetic number, because the mean of its divisors is an integer number (200212204).

Almost surely, 2^400424407 is an apocalyptic number.

400424407 is a deficient number, since it is larger than the sum of its proper divisors (1).

400424407 is an equidigital number, since it uses as much as digits as its factorization.

400424407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 25.

The square root of 400424407 is about 20010.6073620967. The cubic root of 400424407 is about 737.0667957456.

The spelling of 400424407 in words is "four hundred million, four hundred twenty-four thousand, four hundred seven".