1284864025 has 27 divisors (see below), whose sum is σ = 1632622719. Its totient is φ = 1003086480.

The previous prime is 1284864023. The next prime is 1284864043. The reversal of 1284864025 is 5204684821.

It is a happy number.

The square root of 1284864025 is 35845.

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., 462551049 + 822312976 = 21507^2 + 28676^2 .

It is not a de Polignac number, because 1284864025 - 2¹ = 1284864023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1284864023) 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, 12008022 + ... + 12008128.

Almost surely, 2^1284864025 is an apocalyptic number.

1284864025 is the 35845-th square number.

1284864025 is the 17923-rd centered octagonal number.

It is an amenable number.

1284864025 is a deficient number, since it is larger than the sum of its proper divisors (347758694).

1284864025 is an frugal number, since it uses more digits than its factorization.

1284864025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358 (or 179 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 40.

The cubic root of 1284864025 is about 1087.1406202301.

The spelling of 1284864025 in words is "one billion, two hundred eighty-four million, eight hundred sixty-four thousand, twenty-five".