398693 has 2 divisors, whose sum is σ = 398694. Its totient is φ = 398692.

The previous prime is 398683. The next prime is 398711. The reversal of 398693 is 396893.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252004 + 146689 = 502^2 + 383^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398693 is a prime.

It is a super-2 number, since 2×398693² = 317912216498, which contains 22 as substring.

It is a nialpdrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199346 + 199347.

It is an arithmetic number, because the mean of its divisors is an integer number (199347).

2³⁹⁸⁶⁹³ is an apocalyptic number.

It is an amenable number.

398693 is a deficient number, since it is larger than the sum of its proper divisors (1).

398693 is an equidigital number, since it uses as much as digits as its factorization.

398693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 38.

The square root of 398693 is about 631.4214123705. The cubic root of 398693 is about 73.6002919215.

The spelling of 398693 in words is "three hundred ninety-eight thousand, six hundred ninety-three".