1258887726 has 48 divisors (see below), whose sum is σ = 2766516480. Its totient is φ = 413663760.

The previous prime is 1258887713. The next prime is 1258887743. The reversal of 1258887726 is 6277888521.

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 23 ways as a sum of consecutive naturals, for example, 1211115 + ... + 1212153.

It is an arithmetic number, because the mean of its divisors is an integer number (57635760).

Almost surely, 2^1258887726 is an apocalyptic number.

1258887726 is an abundant number, since it is smaller than the sum of its proper divisors (1507628754).

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

1258887726 is a wasteful number, since it uses less digits than its factorization.

1258887726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1941 (or 1938 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 54.

The square root of 1258887726 is about 35480.8078543880. The cubic root of 1258887726 is about 1079.7643879032.

It can be divided in two parts, 125888772 and 6, that added together give a triangular number (125888778 = T₁₅₈₆₇).

The spelling of 1258887726 in words is "one billion, two hundred fifty-eight million, eight hundred eighty-seven thousand, seven hundred twenty-six".