1280585925 has 18 divisors (see below), whose sum is σ = 2293672082. Its totient is φ = 682979040.

The previous prime is 1280585899. The next prime is 1280585939. The reversal of 1280585925 is 5295850821.

It is a happy number.

1280585925 is a `hidden beast` number, since 1 + 2 + 8 + 0 + 58 + 592 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 314246529 + 966339396 = 17727^2 + 31086^2 .

It is not a de Polignac number, because 1280585925 - 2¹⁶ = 1280520389 is a prime.

It is a super-2 number, since 2×1280585925² = 3279800622616211250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2845522 + ... + 2845971.

Almost surely, 2^1280585925 is an apocalyptic number.

1280585925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1280585925 is a deficient number, since it is larger than the sum of its proper divisors (1013086157).

1280585925 is a wasteful number, since it uses less digits than its factorization.

1280585925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5691509 (or 5691501 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 45.

The square root of 1280585925 is about 35785.2752539365. The cubic root of 1280585925 is about 1085.9326927344.

The spelling of 1280585925 in words is "one billion, two hundred eighty million, five hundred eighty-five thousand, nine hundred twenty-five".