1390869 has 18 divisors (see below), whose sum is σ = 2107170. Its totient is φ = 883008.

The previous prime is 1390859. The next prime is 1390891. The reversal of 1390869 is 9680931.

It can be written as a sum of positive squares in 3 ways, for example, as 288369 + 1102500 = 537^2 + 1050^2 .

It is not a de Polignac number, because 1390869 - 2⁹ = 1390357 is a prime.

It is a super-2 number, since 2×1390869² = 3869033150322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390859) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 19017 + ... + 19089.

It is an arithmetic number, because the mean of its divisors is an integer number (117065).

2^1390869 is an apocalyptic number.

It is an amenable number.

1390869 is a deficient number, since it is larger than the sum of its proper divisors (716301).

1390869 is an equidigital number, since it uses as much as digits as its factorization.

1390869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1390869 is about 1179.3510927625. The cubic root of 1390869 is about 111.6251552344.

The spelling of 1390869 in words is "one million, three hundred ninety thousand, eight hundred sixty-nine".