399785776 has 20 divisors (see below), whose sum is σ = 834168832. Its totient is φ = 184516416.

The previous prime is 399785773. The next prime is 399785779. The reversal of 399785776 is 677587993.

It is an interprime number because it is at equal distance from previous prime (399785773) and next prime (399785779).

It is not an unprimeable number, because it can be changed into a prime (399785773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 960816 + ... + 961231.

Almost surely, 2^399785776 is an apocalyptic number.

It is an amenable number.

399785776 is an abundant number, since it is smaller than the sum of its proper divisors (434383056).

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

399785776 is a wasteful number, since it uses less digits than its factorization.

399785776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922068 (or 1922062 counting only the distinct ones).

The product of its digits is 20003760, while the sum is 61.

The square root of 399785776 is about 19994.6436827466. The cubic root of 399785776 is about 736.6747415789.

It can be divided in two parts, 39978 and 5776, that added together give a palindrome (45754).

The spelling of 399785776 in words is "three hundred ninety-nine million, seven hundred eighty-five thousand, seven hundred seventy-six".