399669480 has 288 divisors, whose sum is σ = 1531202400. Its totient is φ = 90139392.

The previous prime is 399669469. The next prime is 399669493. The reversal of 399669480 is 84966993.

It is a happy number.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2451879 + ... + 2452041.

It is an arithmetic number, because the mean of its divisors is an integer number (5316675).

Almost surely, 2^399669480 is an apocalyptic number.

399669480 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 399669480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (765601200).

399669480 is an abundant number, since it is smaller than the sum of its proper divisors (1131532920).

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

399669480 is a wasteful number, since it uses less digits than its factorization.

399669480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 319 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The square root of 399669480 is about 19991.7352923652. The cubic root of 399669480 is about 736.6033027905.

The spelling of 399669480 in words is "three hundred ninety-nine million, six hundred sixty-nine thousand, four hundred eighty".