1399621 has 2 divisors, whose sum is σ = 1399622. Its totient is φ = 1399620.

The previous prime is 1399609. The next prime is 1399633. The reversal of 1399621 is 1269931.

It is a balanced prime because it is at equal distance from previous prime (1399609) and next prime (1399633).

It can be written as a sum of positive squares in only one way, i.e., 923521 + 476100 = 961^2 + 690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1399621 - 2⁵ = 1399589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1399691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699810 + 699811.

It is an arithmetic number, because the mean of its divisors is an integer number (699811).

2^1399621 is an apocalyptic number.

It is an amenable number.

1399621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399621 is an equidigital number, since it uses as much as digits as its factorization.

1399621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 31.

The square root of 1399621 is about 1183.0557890480. The cubic root of 1399621 is about 111.8587984611.

The spelling of 1399621 in words is "one million, three hundred ninety-nine thousand, six hundred twenty-one".