402454478449 has 9 divisors (see below), whose sum is σ = 412536516769. Its totient is φ = 392613139840.

The previous prime is 402454478429. The next prime is 402454478453. The reversal of 402454478449 is 944874454204.

It is a happy number.

The square root of 402454478449 is 634393.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 144016455025 + 258438023424 = 379495^2 + 508368^2 .

It is not a de Polignac number, because 402454478449 - 2⁹ = 402454477937 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402454478449.

It is not an unprimeable number, because it can be changed into a prime (402454478429) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 26002377 + ... + 26017849.

Almost surely, 2^402454478449 is an apocalyptic number.

402454478449 is the 634393-rd square number.

402454478449 is the 317197-th centered octagonal number.

It is an amenable number.

402454478449 is a deficient number, since it is larger than the sum of its proper divisors (10082038320).

402454478449 is an frugal number, since it uses more digits than its factorization.

402454478449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31028 (or 15514 counting only the distinct ones).

The product of its (nonzero) digits is 20643840, while the sum is 55.

The spelling of 402454478449 in words is "four hundred two billion, four hundred fifty-four million, four hundred seventy-eight thousand, four hundred forty-nine".