399764273616 has 80 divisors (see below), whose sum is σ = 1148697312000. Its totient is φ = 133112408832.

The previous prime is 399764273611. The next prime is 399764273641. The reversal of 399764273616 is 616372467993.

399764273616 is a `hidden beast` number, since 3 + 9 + 9 + 7 + 6 + 4 + 2 + 7 + 3 + 616 = 666.

It is a super-2 number, since 2×399764273616² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399764273611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89016 + ... + 898583.

It is an arithmetic number, because the mean of its divisors is an integer number (14358716400).

Almost surely, 2^399764273616 is an apocalyptic number.

399764273616 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 399764273616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (574348656000).

399764273616 is an abundant number, since it is smaller than the sum of its proper divisors (748933038384).

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

399764273616 is a wasteful number, since it uses less digits than its factorization.

399764273616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988553 (or 988541 counting only the distinct ones).

The product of its digits is 61725888, while the sum is 63.

It can be divided in two parts, 399764 and 273616, that added together give a triangular number (673380 = T₁₁₆₀).

The spelling of 399764273616 in words is "three hundred ninety-nine billion, seven hundred sixty-four million, two hundred seventy-three thousand, six hundred sixteen".