400660693 has 2 divisors, whose sum is σ = 400660694. Its totient is φ = 400660692.

The previous prime is 400660691. The next prime is 400660717. The reversal of 400660693 is 396066004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 359405764 + 41254929 = 18958^2 + 6423^2 .

It is a cyclic number.

It is not a de Polignac number, because 400660693 - 2¹ = 400660691 is a prime.

Together with 400660691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400660691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200330346 + 200330347.

It is an arithmetic number, because the mean of its divisors is an integer number (200330347).

Almost surely, 2^400660693 is an apocalyptic number.

It is an amenable number.

400660693 is a deficient number, since it is larger than the sum of its proper divisors (1).

400660693 is an equidigital number, since it uses as much as digits as its factorization.

400660693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 400660693 is about 20016.5105100764. The cubic root of 400660693 is about 737.2117455511.

The spelling of 400660693 in words is "four hundred million, six hundred sixty thousand, six hundred ninety-three".