1392991 has 4 divisors (see below), whose sum is σ = 1395792. Its totient is φ = 1390192.

The previous prime is 1392983. The next prime is 1393003. The reversal of 1392991 is 1992931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1392991 - 2³ = 1392983 is a prime.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1392901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 430 + ... + 1723.

It is an arithmetic number, because the mean of its divisors is an integer number (348948).

2^1392991 is an apocalyptic number.

1392991 is a deficient number, since it is larger than the sum of its proper divisors (2801).

1392991 is an equidigital number, since it uses as much as digits as its factorization.

1392991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2800.

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

The square root of 1392991 is about 1180.2503971616. The cubic root of 1392991 is about 111.6818939161.

The spelling of 1392991 in words is "one million, three hundred ninety-two thousand, nine hundred ninety-one".