6399400212 has 144 divisors (see below), whose sum is σ = 16963931712. Its totient is φ = 2032335360.

The previous prime is 6399400211. The next prime is 6399400213. The reversal of 6399400212 is 2120049936.

6399400212 is a `hidden beast` number, since 6 + 39 + 9 + 400 + 212 = 666.

It is an interprime number because it is at equal distance from previous prime (6399400211) and next prime (6399400213).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6399400211) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16119198 + ... + 16119594.

Almost surely, 2^6399400212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6399400212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8481965856).

6399400212 is an abundant number, since it is smaller than the sum of its proper divisors (10564531500).

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

6399400212 is a wasteful number, since it uses less digits than its factorization.

6399400212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678 (or 673 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 6399400212 is about 79996.2512371674. The cubic root of 6399400212 is about 1856.5775322731.

The spelling of 6399400212 in words is "six billion, three hundred ninety-nine million, four hundred thousand, two hundred twelve".