399825450 has 96 divisors (see below), whose sum is σ = 1106179200. Its totient is φ = 106191360.

The previous prime is 399825403. The next prime is 399825473. The reversal of 399825450 is 54528993.

399825450 is a `hidden beast` number, since 399 + 8 + 254 + 5 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 399825396 and 399825405.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 476131 + ... + 476969.

It is an arithmetic number, because the mean of its divisors is an integer number (11522700).

Almost surely, 2^399825450 is an apocalyptic number.

399825450 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 399825450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (553089600).

399825450 is an abundant number, since it is smaller than the sum of its proper divisors (706353750).

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

399825450 is a wasteful number, since it uses less digits than its factorization.

399825450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213 (or 1202 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 399825450 is about 19995.6357738383. The cubic root of 399825450 is about 736.6991095185.

The spelling of 399825450 in words is "three hundred ninety-nine million, eight hundred twenty-five thousand, four hundred fifty".