1396642544 has 40 divisors (see below), whose sum is σ = 2981260080. Its totient is φ = 628544000.

The previous prime is 1396642529. The next prime is 1396642567. The reversal of 1396642544 is 4452466931.

It is a super-2 number, since 2×1396642544² = 3901220791421583872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 1396642495 and 1396642504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21509 + ... + 57060.

It is an arithmetic number, because the mean of its divisors is an integer number (74531502).

Almost surely, 2^1396642544 is an apocalyptic number.

It is an amenable number.

1396642544 is an abundant number, since it is smaller than the sum of its proper divisors (1584617536).

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

1396642544 is a wasteful number, since it uses less digits than its factorization.

1396642544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78689 (or 78683 counting only the distinct ones).

The product of its digits is 622080, while the sum is 44.

The square root of 1396642544 is about 37371.6810432713. The cubic root of 1396642544 is about 1117.7939527025.

The spelling of 1396642544 in words is "one billion, three hundred ninety-six million, six hundred forty-two thousand, five hundred forty-four".