399097854 has 48 divisors (see below), whose sum is σ = 918655920. Its totient is φ = 129781440.

The previous prime is 399097847. The next prime is 399097859. The reversal of 399097854 is 458790993.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 399097854.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399097859) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9912 + ... + 29940.

It is an arithmetic number, because the mean of its divisors is an integer number (19138665).

Almost surely, 2^399097854 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399097854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (459327960).

399097854 is an abundant number, since it is smaller than the sum of its proper divisors (519558066).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399097854 is a wasteful number, since it uses less digits than its factorization.

399097854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20087 (or 20075 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The square root of 399097854 is about 19977.4336189612. The cubic root of 399097854 is about 736.2519603931.

The spelling of 399097854 in words is "three hundred ninety-nine million, ninety-seven thousand, eight hundred fifty-four".