12904278409 has 27 divisors (see below), whose sum is σ = 14860648999. Its totient is φ = 11196120320.

The previous prime is 12904278389. The next prime is 12904278461. The reversal of 12904278409 is 90487240921.

The square root of 12904278409 is 113597.

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

It can be written as a sum of positive squares in only one way, i.e., 7885972809 + 5018305600 = 88803^2 + 70840^2 .

It is not a de Polignac number, because 12904278409 - 2¹¹ = 12904276361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12904278479) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 28739817 + ... + 28740265.

Almost surely, 2^12904278409 is an apocalyptic number.

12904278409 is the 113597-th square number.

12904278409 is the 56799-th centered octagonal number.

It is an amenable number.

12904278409 is a deficient number, since it is larger than the sum of its proper divisors (1956370590).

12904278409 is an frugal number, since it uses more digits than its factorization.

12904278409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The spelling of 12904278409 in words is "twelve billion, nine hundred four million, two hundred seventy-eight thousand, four hundred nine".