398761 has 4 divisors (see below), whose sum is σ = 435024. Its totient is φ = 362500.

The previous prime is 398759. The next prime is 398771. The reversal of 398761 is 167893.

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, and also an emirpimes, since its reverse is a distinct semiprime: 167893 = 11 ⋅15263.

It is a cyclic number.

It is not a de Polignac number, because 398761 - 2¹ = 398759 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398711) 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, 18115 + ... + 18136.

It is an arithmetic number, because the mean of its divisors is an integer number (108756).

2³⁹⁸⁷⁶¹ is an apocalyptic number.

It is an amenable number.

398761 is a deficient number, since it is larger than the sum of its proper divisors (36263).

398761 is a wasteful number, since it uses less digits than its factorization.

398761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36262.

The product of its digits is 9072, while the sum is 34.

The square root of 398761 is about 631.4752568391. The cubic root of 398761 is about 73.6044760392.

The spelling of 398761 in words is "three hundred ninety-eight thousand, seven hundred sixty-one".