1239872144 has 80 divisors (see below), whose sum is σ = 2828985600. Its totient is φ = 515358720.

The previous prime is 1239872131. The next prime is 1239872149. The reversal of 1239872144 is 4412789321.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (1239872149) 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, 885557 + ... + 886955.

It is an arithmetic number, because the mean of its divisors is an integer number (35362320).

Almost surely, 2^1239872144 is an apocalyptic number.

1239872144 is a gapful number since it is divisible by the number (14) 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 1239872144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1414492800).

1239872144 is an abundant number, since it is smaller than the sum of its proper divisors (1589113456).

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

1239872144 is a wasteful number, since it uses less digits than its factorization.

1239872144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648 (or 1642 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 1239872144 is about 35211.8182433114. The cubic root of 1239872144 is about 1074.3001448702.

The spelling of 1239872144 in words is "one billion, two hundred thirty-nine million, eight hundred seventy-two thousand, one hundred forty-four".