398715 has 16 divisors (see below), whose sum is σ = 672000. Its totient is φ = 201312.

The previous prime is 398711. The next prime is 398729. The reversal of 398715 is 517893.

It is not a de Polignac number, because 398715 - 2² = 398711 is a prime.

398715 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 415 + ... + 984.

It is an arithmetic number, because the mean of its divisors is an integer number (42000).

2³⁹⁸⁷¹⁵ is an apocalyptic number.

398715 is a deficient number, since it is larger than the sum of its proper divisors (273285).

398715 is a wasteful number, since it uses less digits than its factorization.

398715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426.

The product of its digits is 7560, while the sum is 33.

The square root of 398715 is about 631.4388331422. The cubic root of 398715 is about 73.6016456587.

The spelling of 398715 in words is "three hundred ninety-eight thousand, seven hundred fifteen".