1249999240 has 64 divisors (see below), whose sum is σ = 3231077760. Its totient is φ = 426332160.

The previous prime is 1249999199. The next prime is 1249999243. The reversal of 1249999240 is 429999421.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1249999243) 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, 42475 + ... + 65605.

It is an arithmetic number, because the mean of its divisors is an integer number (50485590).

Almost surely, 2^1249999240 is an apocalyptic number.

1249999240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1249999240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1615538880).

1249999240 is an abundant number, since it is smaller than the sum of its proper divisors (1981078520).

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

1249999240 is a wasteful number, since it uses less digits than its factorization.

1249999240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23342 (or 23338 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 1249999240 is about 35355.3283113027. The cubic root of 1249999240 is about 1077.2171266998.

The spelling of 1249999240 in words is "one billion, two hundred forty-nine million, nine hundred ninety-nine thousand, two hundred forty".