1390365 has 20 divisors (see below), whose sum is σ = 2493084. Its totient is φ = 741312.

The previous prime is 1390357. The next prime is 1390369. The reversal of 1390365 is 5630931.

It can be written as a sum of positive squares in 2 ways, for example, as 480249 + 910116 = 693^2 + 954^2 .

It is not a de Polignac number, because 1390365 - 2³ = 1390357 is a prime.

It is a super-2 number, since 2×1390365² = 3866229666450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390369) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1312 + ... + 2121.

2^1390365 is an apocalyptic number.

1390365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1390365 is a deficient number, since it is larger than the sum of its proper divisors (1102719).

1390365 is an equidigital number, since it uses as much as digits as its factorization.

1390365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3450 (or 3441 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 27.

The square root of 1390365 is about 1179.1373965743. The cubic root of 1390365 is about 111.6116706491.

The spelling of 1390365 in words is "one million, three hundred ninety thousand, three hundred sixty-five".