1257719172 has 48 divisors (see below), whose sum is σ = 2970105600. Its totient is φ = 414201600.

The previous prime is 1257719161. The next prime is 1257719191. The reversal of 1257719172 is 2719177521.

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, 533797 + ... + 536147.

It is an arithmetic number, because the mean of its divisors is an integer number (61877200).

Almost surely, 2^1257719172 is an apocalyptic number.

1257719172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1257719172 is an abundant number, since it is smaller than the sum of its proper divisors (1712386428).

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

1257719172 is a wasteful number, since it uses less digits than its factorization.

1257719172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2876 (or 2874 counting only the distinct ones).

The product of its digits is 61740, while the sum is 42.

The square root of 1257719172 is about 35464.3366214568. The cubic root of 1257719172 is about 1079.4301898177.

The spelling of 1257719172 in words is "one billion, two hundred fifty-seven million, seven hundred nineteen thousand, one hundred seventy-two".