1239990720 has 224 divisors, whose sum is σ = 4160885760. Its totient is φ = 312238080.

The previous prime is 1239990683. The next prime is 1239990721. The reversal of 1239990720 is 270999321.

It is a happy number.

It is a super-2 number, since 2×1239990720² = 3075153971372236800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239990721) 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, 1964805 + ... + 1965435.

Almost surely, 2^1239990720 is an apocalyptic number.

1239990720 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 1239990720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2080442880).

1239990720 is an abundant number, since it is smaller than the sum of its proper divisors (2920895040).

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

1239990720 is a wasteful number, since it uses less digits than its factorization.

1239990720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763 (or 753 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 1239990720 is about 35213.5019559259. The cubic root of 1239990720 is about 1074.3343909156.

The spelling of 1239990720 in words is "one billion, two hundred thirty-nine million, nine hundred ninety thousand, seven hundred twenty".