1249999830 has 32 divisors (see below), whose sum is σ = 3333333600. Its totient is φ = 333333216.

The previous prime is 1249999799. The next prime is 1249999831. The reversal of 1249999830 is 389999421.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249999831) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2314545 + ... + 2315084.

It is an arithmetic number, because the mean of its divisors is an integer number (104166675).

Almost surely, 2^1249999830 is an apocalyptic number.

1249999830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1249999830 is an abundant number, since it is smaller than the sum of its proper divisors (2083333770).

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

1249999830 is a wasteful number, since it uses less digits than its factorization.

1249999830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4629645 (or 4629639 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 1249999830 is about 35355.3366551642. The cubic root of 1249999830 is about 1077.2172961821.

The spelling of 1249999830 in words is "one billion, two hundred forty-nine million, nine hundred ninety-nine thousand, eight hundred thirty".