1421779680 has 144 divisors (see below), whose sum is σ = 4889508624. Its totient is φ = 376197120.

The previous prime is 1421779663. The next prime is 1421779703. The reversal of 1421779680 is 869771241.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

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 polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 184872 + ... + 192408.

It is an arithmetic number, because the mean of its divisors is an integer number (33954921).

Almost surely, 2^1421779680 is an apocalyptic number.

1421779680 is a gapful number since it is divisible by the number (10) 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 1421779680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2444754312).

1421779680 is an abundant number, since it is smaller than the sum of its proper divisors (3467728944).

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

1421779680 is a wasteful number, since it uses less digits than its factorization.

1421779680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7689 (or 7678 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 1421779680 is about 37706.4938704197. The cubic root of 1421779680 is about 1124.4602329168.

The spelling of 1421779680 in words is "one billion, four hundred twenty-one million, seven hundred seventy-nine thousand, six hundred eighty".