1393938644 has 24 divisors (see below), whose sum is σ = 2909090688. Its totient is φ = 571428000.

The previous prime is 1393938641. The next prime is 1393938659. The reversal of 1393938644 is 4468393931.

It is a junction number, because it is equal to n+sod(n) for n = 1393938592 and 1393938601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1393938641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1081607 + ... + 1082894.

It is an arithmetic number, because the mean of its divisors is an integer number (121212112).

Almost surely, 2^1393938644 is an apocalyptic number.

1393938644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1393938644 is an abundant number, since it is smaller than the sum of its proper divisors (1515152044).

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

1393938644 is a wasteful number, since it uses less digits than its factorization.

1393938644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2164535 (or 2164533 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 50.

The square root of 1393938644 is about 37335.4877295048. The cubic root of 1393938644 is about 1117.0721369834.

The spelling of 1393938644 in words is "one billion, three hundred ninety-three million, nine hundred thirty-eight thousand, six hundred forty-four".