1257121760 has 24 divisors (see below), whose sum is σ = 2969950536. Its totient is φ = 502848640.

The previous prime is 1257121759. The next prime is 1257121769. The reversal of 1257121760 is 671217521.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257121769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3928346 + ... + 3928665.

It is an arithmetic number, because the mean of its divisors is an integer number (123747939).

Almost surely, 2^1257121760 is an apocalyptic number.

1257121760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1257121760 is an abundant number, since it is smaller than the sum of its proper divisors (1712828776).

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

1257121760 is an equidigital number, since it uses as much as digits as its factorization.

1257121760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7857026 (or 7857018 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 1257121760 is about 35455.9129060302. The cubic root of 1257121760 is about 1079.2592542881.

The spelling of 1257121760 in words is "one billion, two hundred fifty-seven million, one hundred twenty-one thousand, seven hundred sixty".