1390813 has 2 divisors, whose sum is σ = 1390814. Its totient is φ = 1390812.

The previous prime is 1390801. The next prime is 1390841. The reversal of 1390813 is 3180931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1375929 + 14884 = 1173^2 + 122^2 .

It is a cyclic number.

It is not a de Polignac number, because 1390813 - 2¹³ = 1382621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1390913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695406 + 695407.

It is an arithmetic number, because the mean of its divisors is an integer number (695407).

2^1390813 is an apocalyptic number.

It is an amenable number.

1390813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390813 is an equidigital number, since it uses as much as digits as its factorization.

1390813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 1390813 is about 1179.3273506538. The cubic root of 1390813 is about 111.6236571080.

The spelling of 1390813 in words is "one million, three hundred ninety thousand, eight hundred thirteen".