398749 has 8 divisors (see below), whose sum is σ = 441560. Its totient is φ = 357696.

The previous prime is 398731. The next prime is 398759. The reversal of 398749 is 947893.

It can be written as a sum of positive squares in 4 ways, for example, as 79524 + 319225 = 282^2 + 565^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 398749 - 2⁷ = 398621 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 (398729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67 + ... + 895.

It is an arithmetic number, because the mean of its divisors is an integer number (55195).

2³⁹⁸⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

398749 is a deficient number, since it is larger than the sum of its proper divisors (42811).

398749 is a wasteful number, since it uses less digits than its factorization.

398749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879.

The product of its digits is 54432, while the sum is 40.

The square root of 398749 is about 631.4657552077. The cubic root of 398749 is about 73.6037377001.

The spelling of 398749 in words is "three hundred ninety-eight thousand, seven hundred forty-nine".