399897000 has 160 divisors (see below), whose sum is σ = 1398145320. Its totient is φ = 106617600.

The previous prime is 399896983. The next prime is 399897007. The reversal of 399897000 is 798993.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 105637284 + 294259716 = 10278^2 + 17154^2 .

It is a super-2 number, since 2×399897000² = 319835221218000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (399897007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 78532 + ... + 83468.

Almost surely, 2^399897000 is an apocalyptic number.

399897000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399897000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (699072660).

399897000 is an abundant number, since it is smaller than the sum of its proper divisors (998248320).

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

399897000 is a wasteful number, since it uses less digits than its factorization.

399897000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4970 (or 4947 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 399897000 is about 19997.4248342130. The cubic root of 399897000 is about 736.7430517583.

The spelling of 399897000 in words is "three hundred ninety-nine million, eight hundred ninety-seven thousand".