400721207 has 2 divisors, whose sum is σ = 400721208. Its totient is φ = 400721206.

The previous prime is 400721197. The next prime is 400721227. The reversal of 400721207 is 702127004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400721207 - 2⁶ = 400721143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400721227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200360603 + 200360604.

It is an arithmetic number, because the mean of its divisors is an integer number (200360604).

Almost surely, 2^400721207 is an apocalyptic number.

400721207 is a deficient number, since it is larger than the sum of its proper divisors (1).

400721207 is an equidigital number, since it uses as much as digits as its factorization.

400721207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 400721207 is about 20018.0220551382. The cubic root of 400721207 is about 737.2488587382.

The spelling of 400721207 in words is "four hundred million, seven hundred twenty-one thousand, two hundred seven".