1290365 has 8 divisors (see below), whose sum is σ = 1554648. Its totient is φ = 1028160.

The previous prime is 1290329. The next prime is 1290371. The reversal of 1290365 is 5630921.

It can be written as a sum of positive squares in 4 ways, for example, as 196249 + 1094116 = 443^2 + 1046^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1290365 - 2⁸ = 1290109 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1799 + ... + 2411.

It is an arithmetic number, because the mean of its divisors is an integer number (194331).

2^1290365 is an apocalyptic number.

It is an amenable number.

1290365 is a deficient number, since it is larger than the sum of its proper divisors (264283).

1290365 is an equidigital number, since it uses as much as digits as its factorization.

1290365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1039.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 1290365 is about 1135.9423400860. The cubic root of 1290365 is about 108.8689894143.

The spelling of 1290365 in words is "one million, two hundred ninety thousand, three hundred sixty-five".