1421291808 has 216 divisors, whose sum is σ = 4456604880. Its totient is φ = 428440320.

The previous prime is 1421291803. The next prime is 1421291843. The reversal of 1421291808 is 8081921241.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (1421291803) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 2894443 + ... + 2894933.

It is an arithmetic number, because the mean of its divisors is an integer number (20632430).

Almost surely, 2^1421291808 is an apocalyptic number.

1421291808 is a gapful number since it is divisible by the number (18) 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 1421291808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2228302440).

1421291808 is an abundant number, since it is smaller than the sum of its proper divisors (3035313072).

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

1421291808 is a wasteful number, since it uses less digits than its factorization.

1421291808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572 (or 538 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 1421291808 is about 37700.0239787722. The cubic root of 1421291808 is about 1124.3316017769.

The spelling of 1421291808 in words is "one billion, four hundred twenty-one million, two hundred ninety-one thousand, eight hundred eight".