1375437644 has 36 divisors (see below), whose sum is σ = 2821424760. Its totient is φ = 584962560.

The previous prime is 1375437641. The next prime is 1375437659. The reversal of 1375437644 is 4467345731.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1375437595 and 1375437604.

It is not an unprimeable number, because it can be changed into a prime (1375437641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1109 + ... + 52460.

It is an arithmetic number, because the mean of its divisors is an integer number (78372910).

Almost surely, 2^1375437644 is an apocalyptic number.

1375437644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1375437644 is an abundant number, since it is smaller than the sum of its proper divisors (1445987116).

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

1375437644 is a wasteful number, since it uses less digits than its factorization.

1375437644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53718 (or 53709 counting only the distinct ones).

The product of its digits is 846720, while the sum is 44.

The square root of 1375437644 is about 37086.8931564778. The cubic root of 1375437644 is about 1112.1080099267.

The spelling of 1375437644 in words is "one billion, three hundred seventy-five million, four hundred thirty-seven thousand, six hundred forty-four".