1249989489 has 80 divisors (see below), whose sum is σ = 2203880448. Its totient is φ = 691231968.

The previous prime is 1249989473. The next prime is 1249989527. The reversal of 1249989489 is 9849899421.

It is not a de Polignac number, because 1249989489 - 2⁴ = 1249989473 is a prime.

It is a super-2 number, since 2×1249989489² = 3124947445220962242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (1249981489) 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 79 ways as a sum of consecutive naturals, for example, 4071474 + ... + 4071780.

Almost surely, 2^1249989489 is an apocalyptic number.

It is an amenable number.

1249989489 is a deficient number, since it is larger than the sum of its proper divisors (953890959).

1249989489 is a wasteful number, since it uses less digits than its factorization.

1249989489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536 (or 527 counting only the distinct ones).

The product of its digits is 13436928, while the sum is 63.

The square root of 1249989489 is about 35355.1904110273. The cubic root of 1249989489 is about 1077.2143256391.

The spelling of 1249989489 in words is "one billion, two hundred forty-nine million, nine hundred eighty-nine thousand, four hundred eighty-nine".