1391644 has 12 divisors (see below), whose sum is σ = 2501464. Its totient is φ = 676944.

The previous prime is 1391641. The next prime is 1391647. The reversal of 1391644 is 4461931.

It is an interprime number because it is at equal distance from previous prime (1391641) and next prime (1391647).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4554 + ... + 4849.

2^1391644 is an apocalyptic number.

It is an amenable number.

1391644 is a deficient number, since it is larger than the sum of its proper divisors (1109820).

1391644 is a wasteful number, since it uses less digits than its factorization.

1391644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9444 (or 9442 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 1391644 is about 1179.6796175233. The cubic root of 1391644 is about 111.6458841054.

The spelling of 1391644 in words is "one million, three hundred ninety-one thousand, six hundred forty-four".