1257492280 has 32 divisors (see below), whose sum is σ = 3086573040. Its totient is φ = 457269760.

The previous prime is 1257492241. The next prime is 1257492331. The reversal of 1257492280 is 822947521.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1428529 + ... + 1429408.

Almost surely, 2^1257492280 is an apocalyptic number.

1257492280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1257492280 is an abundant number, since it is smaller than the sum of its proper divisors (1829080760).

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

1257492280 is a wasteful number, since it uses less digits than its factorization.

1257492280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857959 (or 2857955 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 1257492280 is about 35461.1376016055. The cubic root of 1257492280 is about 1079.3652763327.

The spelling of 1257492280 in words is "one billion, two hundred fifty-seven million, four hundred ninety-two thousand, two hundred eighty".