1258399992 has 16 divisors (see below), whose sum is σ = 3146000040. Its totient is φ = 419466656.

The previous prime is 1258399973. The next prime is 1258399997. The reversal of 1258399992 is 2999938521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1258399997) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 26216643 + ... + 26216690.

Almost surely, 2^1258399992 is an apocalyptic number.

1258399992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1258399992 is an abundant number, since it is smaller than the sum of its proper divisors (1887600048).

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

1258399992 is a wasteful number, since it uses less digits than its factorization.

1258399992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52433342 (or 52433338 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 57.

The square root of 1258399992 is about 35473.9339797548. The cubic root of 1258399992 is about 1079.6249246241.

It can be divided in two parts, 12583 and 99992, that added together give a triangular number (112575 = T₄₇₄).

The spelling of 1258399992 in words is "one billion, two hundred fifty-eight million, three hundred ninety-nine thousand, nine hundred ninety-two".