399647348 has 18 divisors (see below), whose sum is σ = 713098134. Its totient is φ = 195910624.

The previous prime is 399647329. The next prime is 399647357. The reversal of 399647348 is 843746993.

It can be written as a sum of positive squares in 3 ways, for example, as 342916324 + 56731024 = 18518^2 + 7532^2 .

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a self number, because there is not a number n which added to its sum of digits gives 399647348.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 290390 + ... + 291762.

It is an arithmetic number, because the mean of its divisors is an integer number (39616563).

Almost surely, 2^399647348 is an apocalyptic number.

It is an amenable number.

399647348 is a deficient number, since it is larger than the sum of its proper divisors (313450786).

399647348 is an equidigital number, since it uses as much as digits as its factorization.

399647348 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2803 (or 1428 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 53.

The square root of 399647348 is about 19991.1817559643. The cubic root of 399647348 is about 736.5897058844.

Multiplying 399647348 by its sum of digits (53), we get a square (21181309444 = 145538²).

399647348 divided by its sum of digits (53) gives a square (7540516 = 2746²).

The spelling of 399647348 in words is "three hundred ninety-nine million, six hundred forty-seven thousand, three hundred forty-eight".