399370453 has 2 divisors, whose sum is σ = 399370454. Its totient is φ = 399370452.

The previous prime is 399370429. The next prime is 399370471. The reversal of 399370453 is 354073993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 361646289 + 37724164 = 19017^2 + 6142^2 .

It is a cyclic number.

It is not a de Polignac number, because 399370453 - 2⁹ = 399369941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399370403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199685226 + 199685227.

It is an arithmetic number, because the mean of its divisors is an integer number (199685227).

Almost surely, 2^399370453 is an apocalyptic number.

It is an amenable number.

399370453 is a deficient number, since it is larger than the sum of its proper divisors (1).

399370453 is an equidigital number, since it uses as much as digits as its factorization.

399370453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 306180, while the sum is 43.

The square root of 399370453 is about 19984.2551274747. The cubic root of 399370453 is about 736.4195515973.

The spelling of 399370453 in words is "three hundred ninety-nine million, three hundred seventy thousand, four hundred fifty-three".