399774450 has 96 divisors (see below), whose sum is σ = 1032076800. Its totient is φ = 102297600.

The previous prime is 399774439. The next prime is 399774457. The reversal of 399774450 is 54477993.

It is a happy number.

It is a super-2 number, since 2×399774450² = 319639221745605000, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 399774450.

It is not an unprimeable number, because it can be changed into a prime (399774457) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 692562 + ... + 693138.

It is an arithmetic number, because the mean of its divisors is an integer number (10750800).

Almost surely, 2^399774450 is an apocalyptic number.

399774450 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 399774450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (516038400).

399774450 is an abundant number, since it is smaller than the sum of its proper divisors (632302350).

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

399774450 is a wasteful number, since it uses less digits than its factorization.

399774450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772 (or 767 counting only the distinct ones).

The product of its (nonzero) digits is 952560, while the sum is 48.

The square root of 399774450 is about 19994.3604548883. The cubic root of 399774450 is about 736.6677848057.

The spelling of 399774450 in words is "three hundred ninety-nine million, seven hundred seventy-four thousand, four hundred fifty".