1389992 has 16 divisors (see below), whose sum is σ = 2619540. Its totient is φ = 691456.

The previous prime is 1389991. The next prime is 1390003. The reversal of 1389992 is 2999831.

It can be written as a sum of positive squares in 2 ways, for example, as 1240996 + 148996 = 1114^2 + 386^2 .

It is not an unprimeable number, because it can be changed into a prime (1389991) 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, 2048 + ... + 2640.

2^1389992 is an apocalyptic number.

It is an amenable number.

1389992 is a deficient number, since it is larger than the sum of its proper divisors (1229548).

1389992 is a wasteful number, since it uses less digits than its factorization.

1389992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892 (or 888 counting only the distinct ones).

The product of its digits is 34992, while the sum is 41.

The square root of 1389992 is about 1178.9792194946. The cubic root of 1389992 is about 111.6016888873.

The spelling of 1389992 in words is "one million, three hundred eighty-nine thousand, nine hundred ninety-two".