1304400397 has 2 divisors, whose sum is σ = 1304400398. Its totient is φ = 1304400396.

The previous prime is 1304400389. The next prime is 1304400401. The reversal of 1304400397 is 7930044031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 932141961 + 372258436 = 30531^2 + 19294^2 .

It is a cyclic number.

It is not a de Polignac number, because 1304400397 - 2³ = 1304400389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1304400347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 652200198 + 652200199.

It is an arithmetic number, because the mean of its divisors is an integer number (652200199).

Almost surely, 2^1304400397 is an apocalyptic number.

It is an amenable number.

1304400397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1304400397 is an equidigital number, since it uses as much as digits as its factorization.

1304400397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 1304400397 is about 36116.4837297321. The cubic root of 1304400397 is about 1092.6229223872.

The spelling of 1304400397 in words is "one billion, three hundred four million, four hundred thousand, three hundred ninety-seven".