1393444444 has 24 divisors (see below), whose sum is σ = 2788369920. Its totient is φ = 596873136.

The previous prime is 1393444441. The next prime is 1393444447. The reversal of 1393444444 is 4444443931.

It is an interprime number because it is at equal distance from previous prime (1393444441) and next prime (1393444447).

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1393444397 and 1393444406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1393444441) 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, 44889 + ... + 69295.

It is an arithmetic number, because the mean of its divisors is an integer number (116182080).

Almost surely, 2^1393444444 is an apocalyptic number.

1393444444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1393444444 is an abundant number, since it is smaller than the sum of its proper divisors (1394925476).

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

1393444444 is a wasteful number, since it uses less digits than its factorization.

1393444444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26457 (or 26455 counting only the distinct ones).

The product of its digits is 331776, while the sum is 40.

The square root of 1393444444 is about 37328.8687747164. The cubic root of 1393444444 is about 1116.9401076657.

The spelling of 1393444444 in words is "one billion, three hundred ninety-three million, four hundred forty-four thousand, four hundred forty-four".