400399361 has 2 divisors, whose sum is σ = 400399362. Its totient is φ = 400399360.

The previous prime is 400399339. The next prime is 400399381. The reversal of 400399361 is 163993004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 398760961 + 1638400 = 19969^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 400399361 - 2¹⁰ = 400398337 is a prime.

It is not a weakly prime, because it can be changed into another prime (400399381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200199680 + 200199681.

It is an arithmetic number, because the mean of its divisors is an integer number (200199681).

Almost surely, 2^400399361 is an apocalyptic number.

It is an amenable number.

400399361 is a deficient number, since it is larger than the sum of its proper divisors (1).

400399361 is an equidigital number, since it uses as much as digits as its factorization.

400399361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 35.

The square root of 400399361 is about 20009.9815342244. The cubic root of 400399361 is about 737.0514279179.

The spelling of 400399361 in words is "four hundred million, three hundred ninety-nine thousand, three hundred sixty-one".