1258991040 has 56 divisors (see below), whose sum is σ = 3997299600. Its totient is φ = 335730688.

The previous prime is 1258991009. The next prime is 1258991051. The reversal of 1258991040 is 401998521.

It is a self number, because there is not a number n which added to its sum of digits gives 1258991040.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 654765 + ... + 656684.

It is an arithmetic number, because the mean of its divisors is an integer number (71380350).

Almost surely, 2^1258991040 is an apocalyptic number.

1258991040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1258991040 is an abundant number, since it is smaller than the sum of its proper divisors (2738308560).

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

1258991040 is a wasteful number, since it uses less digits than its factorization.

1258991040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311469 (or 1311459 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 1258991040 is about 35482.2637383806. The cubic root of 1258991040 is about 1079.7939250160.

The spelling of 1258991040 in words is "one billion, two hundred fifty-eight million, nine hundred ninety-one thousand, forty".