1392661 has 4 divisors (see below), whose sum is σ = 1403424. Its totient is φ = 1381900.

The previous prime is 1392649. The next prime is 1392679. The reversal of 1392661 is 1662931.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1662931 = 787 ⋅2113.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1392661 is a prime.

It is an Ulam number.

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 (1392631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5185 + ... + 5446.

It is an arithmetic number, because the mean of its divisors is an integer number (350856).

2^1392661 is an apocalyptic number.

It is an amenable number.

1392661 is a deficient number, since it is larger than the sum of its proper divisors (10763).

1392661 is a wasteful number, since it uses less digits than its factorization.

1392661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10762.

The product of its digits is 1944, while the sum is 28.

The square root of 1392661 is about 1180.1105880383. The cubic root of 1392661 is about 111.6730740612.

The spelling of 1392661 in words is "one million, three hundred ninety-two thousand, six hundred sixty-one".