1421989506 has 160 divisors (see below), whose sum is σ = 3762422400. Its totient is φ = 401218272.

The previous prime is 1421989501. The next prime is 1421989529. The reversal of 1421989506 is 6059891241.

It is not an unprimeable number, because it can be changed into a prime (1421989501) 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 79 ways as a sum of consecutive naturals, for example, 8723781 + ... + 8723943.

It is an arithmetic number, because the mean of its divisors is an integer number (23515140).

Almost surely, 2^1421989506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1421989506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1881211200).

1421989506 is an abundant number, since it is smaller than the sum of its proper divisors (2340432894).

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

1421989506 is a wasteful number, since it uses less digits than its factorization.

1421989506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The square root of 1421989506 is about 37709.2761267039. The cubic root of 1421989506 is about 1124.5155460783.

The spelling of 1421989506 in words is "one billion, four hundred twenty-one million, nine hundred eighty-nine thousand, five hundred six".