1398623 has 2 divisors, whose sum is σ = 1398624. Its totient is φ = 1398622.

The previous prime is 1398619. The next prime is 1398659. The reversal of 1398623 is 3268931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1398623 - 2² = 1398619 is a prime.

It is a super-2 number, since 2×1398623² = 3912292592258, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1398623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1398323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699311 + 699312.

It is an arithmetic number, because the mean of its divisors is an integer number (699312).

2^1398623 is an apocalyptic number.

1398623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1398623 is an equidigital number, since it uses as much as digits as its factorization.

1398623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 32.

The square root of 1398623 is about 1182.6339247629. The cubic root of 1398623 is about 111.8322051607.

The spelling of 1398623 in words is "one million, three hundred ninety-eight thousand, six hundred twenty-three".