1390388 has 12 divisors (see below), whose sum is σ = 2443812. Its totient is φ = 692160.

The previous prime is 1390387. The next prime is 1390391. The reversal of 1390388 is 8830931.

It can be written as a sum of positive squares in 2 ways, for example, as 996004 + 394384 = 998^2 + 628^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390387) 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, 506 + ... + 1742.

It is an arithmetic number, because the mean of its divisors is an integer number (203651).

2^1390388 is an apocalyptic number.

It is an amenable number.

1390388 is a deficient number, since it is larger than the sum of its proper divisors (1053424).

1390388 is a wasteful number, since it uses less digits than its factorization.

1390388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522 (or 1520 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 1390388 is about 1179.1471494262. The cubic root of 1390388 is about 111.6122860880.

The spelling of 1390388 in words is "one million, three hundred ninety thousand, three hundred eighty-eight".