399407436 has 132 divisors (see below), whose sum is σ = 1116019800. Its totient is φ = 124711488.

The previous prime is 399407419. The next prime is 399407461. The reversal of 399407436 is 634704993.

It is a junction number, because it is equal to n+sod(n) for n = 399407391 and 399407400.

It is an unprimeable number.

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 43 ways as a sum of consecutive naturals, for example, 4487680 + ... + 4487768.

Almost surely, 2^399407436 is an apocalyptic number.

399407436 is a gapful number since it is divisible by the number (36) 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 399407436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (558009900).

399407436 is an abundant number, since it is smaller than the sum of its proper divisors (716612364).

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

399407436 is an equidigital number, since it uses as much as digits as its factorization.

399407436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142 (or 113 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 45.

The square root of 399407436 is about 19985.1804094934. The cubic root of 399407436 is about 736.4422825091.

The spelling of 399407436 in words is "three hundred ninety-nine million, four hundred seven thousand, four hundred thirty-six".