1257385872 has 80 divisors (see below), whose sum is σ = 3309232640. Its totient is φ = 411319296.

The previous prime is 1257385861. The next prime is 1257385897. The reversal of 1257385872 is 2785837521.

It is a super-2 number, since 2×1257385872² = 3162038462210400768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 801633 + ... + 803199.

It is an arithmetic number, because the mean of its divisors is an integer number (41365408).

Almost surely, 2^1257385872 is an apocalyptic number.

1257385872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1257385872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1654616320).

1257385872 is an abundant number, since it is smaller than the sum of its proper divisors (2051846768).

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

1257385872 is a wasteful number, since it uses less digits than its factorization.

1257385872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880 (or 1874 counting only the distinct ones).

The product of its digits is 940800, while the sum is 48.

The square root of 1257385872 is about 35459.6372231866. The cubic root of 1257385872 is about 1079.3348304626.

The spelling of 1257385872 in words is "one billion, two hundred fifty-seven million, three hundred eighty-five thousand, eight hundred seventy-two".