1421791440 has 320 divisors, whose sum is σ = 4799692800. Its totient is φ = 347443200.

The previous prime is 1421791433. The next prime is 1421791453. The reversal of 1421791440 is 441971241.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17997321 + ... + 17997399.

It is an arithmetic number, because the mean of its divisors is an integer number (14999040).

Almost surely, 2^1421791440 is an apocalyptic number.

1421791440 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 1421791440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2399846400).

1421791440 is an abundant number, since it is smaller than the sum of its proper divisors (3377901360).

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

1421791440 is a wasteful number, since it uses less digits than its factorization.

1421791440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 1421791440 is about 37706.6498114059. The cubic root of 1421791440 is about 1124.4633331665.

The spelling of 1421791440 in words is "one billion, four hundred twenty-one million, seven hundred ninety-one thousand, four hundred forty".