398861 has 4 divisors (see below), whose sum is σ = 401472. Its totient is φ = 396252.

The previous prime is 398857. The next prime is 398863. The reversal of 398861 is 168893.

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.

It is a cyclic number.

It is not a de Polignac number, because 398861 - 2² = 398857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398863) 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, 1061 + ... + 1386.

It is an arithmetic number, because the mean of its divisors is an integer number (100368).

2³⁹⁸⁸⁶¹ is an apocalyptic number.

It is an amenable number.

398861 is a deficient number, since it is larger than the sum of its proper divisors (2611).

398861 is a wasteful number, since it uses less digits than its factorization.

398861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2610.

The product of its digits is 10368, while the sum is 35.

The square root of 398861 is about 631.5544315417. The cubic root of 398861 is about 73.6106282895.

The spelling of 398861 in words is "three hundred ninety-eight thousand, eight hundred sixty-one".