1392981 has 4 divisors (see below), whose sum is σ = 1857312. Its totient is φ = 928652.

The previous prime is 1392977. The next prime is 1392983. The reversal of 1392981 is 1892931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1392981 - 2² = 1392977 is a prime.

It is a super-2 number, since 2×1392981² = 3880792132722, which contains 22 as substring.

It is a D-number.

It is a Curzon 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 (1392983) 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, 232161 + ... + 232166.

It is an arithmetic number, because the mean of its divisors is an integer number (464328).

2^1392981 is an apocalyptic number.

It is an amenable number.

1392981 is a deficient number, since it is larger than the sum of its proper divisors (464331).

1392981 is an equidigital number, since it uses as much as digits as its factorization.

1392981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464330.

The product of its digits is 3888, while the sum is 33.

The square root of 1392981 is about 1180.2461607648. The cubic root of 1392981 is about 111.6816266683.

The spelling of 1392981 in words is "one million, three hundred ninety-two thousand, nine hundred eighty-one".