1421643366 has 128 divisors (see below), whose sum is σ = 3765242880. Its totient is φ = 391910400.

The previous prime is 1421643359. The next prime is 1421643367. The reversal of 1421643366 is 6633461241.

1421643366 is a `hidden beast` number, since 1 + 4 + 2 + 1 + 643 + 3 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1421643366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421643367) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 546966 + ... + 549558.

It is an arithmetic number, because the mean of its divisors is an integer number (29415960).

Almost surely, 2^1421643366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1421643366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1882621440).

1421643366 is an abundant number, since it is smaller than the sum of its proper divisors (2343599514).

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

1421643366 is a wasteful number, since it uses less digits than its factorization.

1421643366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2699 (or 2693 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 1421643366 is about 37704.6862604637. The cubic root of 1421643366 is about 1124.4242956632.

It can be divided in two parts, 142164 and 3366, that added together give a triangular number (145530 = T₅₃₉).

The spelling of 1421643366 in words is "one billion, four hundred twenty-one million, six hundred forty-three thousand, three hundred sixty-six".