1387220744 has 64 divisors (see below), whose sum is σ = 3255638400. Its totient is φ = 539472384.

The previous prime is 1387220717. The next prime is 1387220753. The reversal of 1387220744 is 4470227831.

It is a junction number, because it is equal to n+sod(n) for n = 1387220698 and 1387220707.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26804 + ... + 59100.

It is an arithmetic number, because the mean of its divisors is an integer number (50869350).

Almost surely, 2^1387220744 is an apocalyptic number.

1387220744 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 1387220744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1627819200).

1387220744 is an abundant number, since it is smaller than the sum of its proper divisors (1868417656).

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

1387220744 is a wasteful number, since it uses less digits than its factorization.

1387220744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32382 (or 32378 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 1387220744 is about 37245.4123886419. The cubic root of 1387220744 is about 1115.2747200569.

The spelling of 1387220744 in words is "one billion, three hundred eighty-seven million, two hundred twenty thousand, seven hundred forty-four".