1390646093 has 8 divisors (see below), whose sum is σ = 1408197240. Its totient is φ = 1373137920.

The previous prime is 1390646069. The next prime is 1390646099. The reversal of 1390646093 is 3906460931.

It can be written as a sum of positive squares in 4 ways, for example, as 12974404 + 1377671689 = 3602^2 + 37117^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1390646093 - 2²² = 1386451789 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1390646093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1390646099) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57053 + ... + 77693.

It is an arithmetic number, because the mean of its divisors is an integer number (176024655).

Almost surely, 2^1390646093 is an apocalyptic number.

It is an amenable number.

1390646093 is a deficient number, since it is larger than the sum of its proper divisors (17551147).

1390646093 is an equidigital number, since it uses as much as digits as its factorization.

1390646093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21487.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 1390646093 is about 37291.3675399549. The cubic root of 1390646093 is about 1116.1919173054.

The spelling of 1390646093 in words is "one billion, three hundred ninety million, six hundred forty-six thousand, ninety-three".