399748 has 18 divisors (see below), whose sum is σ = 728826. Its totient is φ = 191808.

The previous prime is 399739. The next prime is 399757. The reversal of 399748 is 847993.

399748 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (399739) and next prime (399757).

It can be written as a sum of positive squares in 3 ways, for example, as 238144 + 161604 = 488^2 + 402^2 .

It is a d-powerful number, because it can be written as 3⁷ + 9⁵ + 7⁵ + 9⁵ + 4⁹ + 8³ .

Its product of digits (54432) is a multiple of the sum of its prime divisors (112).

It is a self number, because there is not a number n which added to its sum of digits gives 399748.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5440 + ... + 5512.

2³⁹⁹⁷⁴⁸ is an apocalyptic number.

It is an amenable number.

399748 is a deficient number, since it is larger than the sum of its proper divisors (329078).

399748 is a wasteful number, since it uses less digits than its factorization.

399748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 112 counting only the distinct ones).

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

The square root of 399748 is about 632.2562771535. The cubic root of 399748 is about 73.6651537901.

The spelling of 399748 in words is "three hundred ninety-nine thousand, seven hundred forty-eight".