1365997 has 4 divisors (see below), whose sum is σ = 1399356. Its totient is φ = 1332640.

The previous prime is 1365983. The next prime is 1366009. The reversal of 1365997 is 7995631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7995631 = 7 ⋅1142233.

It can be written as a sum of positive squares in 2 ways, for example, as 212521 + 1153476 = 461^2 + 1074^2 .

It is a cyclic number.

It is not a de Polignac number, because 1365997 - 2⁷ = 1365869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1365907) 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, 16618 + ... + 16699.

It is an arithmetic number, because the mean of its divisors is an integer number (349839).

2^1365997 is an apocalyptic number.

It is an amenable number.

1365997 is a deficient number, since it is larger than the sum of its proper divisors (33359).

1365997 is an equidigital number, since it uses as much as digits as its factorization.

1365997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33358.

The product of its digits is 51030, while the sum is 40.

The square root of 1365997 is about 1168.7587432828. The cubic root of 1365997 is about 110.9557760143.

The spelling of 1365997 in words is "one million, three hundred sixty-five thousand, nine hundred ninety-seven".