1257045684 has 24 divisors (see below), whose sum is σ = 2934361920. Its totient is φ = 418835904.

The previous prime is 1257045683. The next prime is 1257045689. The reversal of 1257045684 is 4865407521.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257045683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8497 + ... + 50855.

It is an arithmetic number, because the mean of its divisors is an integer number (122265080).

Almost surely, 2^1257045684 is an apocalyptic number.

It is an amenable number.

1257045684 is an abundant number, since it is smaller than the sum of its proper divisors (1677316236).

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

1257045684 is a wasteful number, since it uses less digits than its factorization.

1257045684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44839 (or 44837 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 42.

The square root of 1257045684 is about 35454.8400645102. The cubic root of 1257045684 is about 1079.2374830256.

The spelling of 1257045684 in words is "one billion, two hundred fifty-seven million, forty-five thousand, six hundred eighty-four".