1421820456 has 192 divisors, whose sum is σ = 4372346880. Its totient is φ = 383564160.

The previous prime is 1421820437. The next prime is 1421820493. The reversal of 1421820456 is 6540281241.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1567155 + ... + 1568061.

It is an arithmetic number, because the mean of its divisors is an integer number (22772640).

Almost surely, 2^1421820456 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 1421820456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2186173440).

1421820456 is an abundant number, since it is smaller than the sum of its proper divisors (2950526424).

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

1421820456 is a wasteful number, since it uses less digits than its factorization.

1421820456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004 (or 993 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 1421820456 is about 37707.0345691623. The cubic root of 1421820456 is about 1124.4709824848.

The spelling of 1421820456 in words is "one billion, four hundred twenty-one million, eight hundred twenty thousand, four hundred fifty-six".