1390630321 has 4 divisors (see below), whose sum is σ = 1390706752. Its totient is φ = 1390553892.

The previous prime is 1390630309. The next prime is 1390630357. The reversal of 1390630321 is 1230360931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1390630321 - 2¹⁵ = 1390597553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1390630321.

It is not an unprimeable number, because it can be changed into a prime (1390630391) 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, 6580 + ... + 53146.

It is an arithmetic number, because the mean of its divisors is an integer number (347676688).

Almost surely, 2^1390630321 is an apocalyptic number.

It is an amenable number.

1390630321 is a deficient number, since it is larger than the sum of its proper divisors (76431).

1390630321 is an equidigital number, since it uses as much as digits as its factorization.

1390630321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76430.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 1390630321 is about 37291.1560695026. The cubic root of 1390630321 is about 1116.1876975293.

The spelling of 1390630321 in words is "one billion, three hundred ninety million, six hundred thirty thousand, three hundred twenty-one".