1391992 has 48 divisors (see below), whose sum is σ = 3139560. Its totient is φ = 576576.

The previous prime is 1391989. The next prime is 1392007. The reversal of 1391992 is 2991931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20743 + ... + 20809.

2^1391992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1391992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1569780).

1391992 is an abundant number, since it is smaller than the sum of its proper divisors (1747568).

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

1391992 is a wasteful number, since it uses less digits than its factorization.

1391992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 129 counting only the distinct ones).

The product of its digits is 4374, while the sum is 34.

The square root of 1391992 is about 1179.8271059778. The cubic root of 1391992 is about 111.6551895335.

The spelling of 1391992 in words is "one million, three hundred ninety-one thousand, nine hundred ninety-two".