1249538580 has 72 divisors (see below), whose sum is σ = 3854541600. Its totient is φ = 327559872.

The previous prime is 1249538567. The next prime is 1249538597. The reversal of 1249538580 is 858359421.

1249538580 is a `hidden beast` number, since 1 + 2 + 495 + 3 + 85 + 80 = 666.

It is a super-2 number, since 2×1249538580² = 3122693325816832800, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48210 + ... + 69449.

It is an arithmetic number, because the mean of its divisors is an integer number (53535300).

Almost surely, 2^1249538580 is an apocalyptic number.

1249538580 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1249538580 is an abundant number, since it is smaller than the sum of its proper divisors (2605003020).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1249538580 is a wasteful number, since it uses less digits than its factorization.

1249538580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117733 (or 117728 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The square root of 1249538580 is about 35348.8129928008. The cubic root of 1249538580 is about 1077.0847821361.

The spelling of 1249538580 in words is "one billion, two hundred forty-nine million, five hundred thirty-eight thousand, five hundred eighty".