1421665344 has 280 divisors, whose sum is σ = 4660257888. Its totient is φ = 424949760.

The previous prime is 1421665331. The next prime is 1421665373. The reversal of 1421665344 is 4435661241.

It is a super-2 number, since 2×1421665344² = 4042264700661276672, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 1421665299 and 1421665308.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6101452 + ... + 6101684.

Almost surely, 2^1421665344 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 1421665344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2330128944).

1421665344 is an abundant number, since it is smaller than the sum of its proper divisors (3238592544).

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

1421665344 is a wasteful number, since it uses less digits than its factorization.

1421665344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375 (or 356 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 1421665344 is about 37704.9777085201. The cubic root of 1421665344 is about 1124.4300900066.

The spelling of 1421665344 in words is "one billion, four hundred twenty-one million, six hundred sixty-five thousand, three hundred forty-four".