1249633899 has 40 divisors (see below), whose sum is σ = 1892261888. Its totient is φ = 821787120.

The previous prime is 1249633897. The next prime is 1249633919. The reversal of 1249633899 is 9983369421.

It is not a de Polignac number, because 1249633899 - 2¹ = 1249633897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1249633897) 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 39 ways as a sum of consecutive naturals, for example, 3404814 + ... + 3405180.

Almost surely, 2^1249633899 is an apocalyptic number.

1249633899 is a deficient number, since it is larger than the sum of its proper divisors (642627989).

1249633899 is a wasteful number, since it uses less digits than its factorization.

1249633899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837 (or 828 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 54.

The square root of 1249633899 is about 35350.1612301839. The cubic root of 1249633899 is about 1077.1121693214.

The spelling of 1249633899 in words is "one billion, two hundred forty-nine million, six hundred thirty-three thousand, eight hundred ninety-nine".