1249999998 has 64 divisors (see below), whose sum is σ = 2816335872. Its totient is φ = 366981120.

The previous prime is 1249999997. The next prime is 1250000027. The reversal of 1249999998 is 8999999421.

1249999998 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249999991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1149411 + ... + 1150497.

It is an arithmetic number, because the mean of its divisors is an integer number (44005248).

Almost surely, 2^1249999998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1249999998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1408167936).

1249999998 is an abundant number, since it is smaller than the sum of its proper divisors (1566335874).

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

1249999998 is a wasteful number, since it uses less digits than its factorization.

1249999998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769.

The product of its digits is 34012224, while the sum is 69.

The square root of 1249999998 is about 35355.3390310431. The cubic root of 1249999998 is about 1077.2173444414.

The spelling of 1249999998 in words is "one billion, two hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-eight".