399700980 has 288 divisors, whose sum is σ = 1487216640. Its totient is φ = 88179840.

The previous prime is 399700979. The next prime is 399701069. The reversal of 399700980 is 89007993.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1054431 + ... + 1054809.

Almost surely, 2^399700980 is an apocalyptic number.

399700980 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 399700980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (743608320).

399700980 is an abundant number, since it is smaller than the sum of its proper divisors (1087515660).

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

399700980 is a wasteful number, since it uses less digits than its factorization.

399700980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 399700980 is about 19992.5231024001. The cubic root of 399700980 is about 736.6226541093.

The spelling of 399700980 in words is "three hundred ninety-nine million, seven hundred thousand, nine hundred eighty".