1421897598 has 128 divisors (see below), whose sum is σ = 3558297600. Its totient is φ = 417160800.

The previous prime is 1421897597. The next prime is 1421897639. The reversal of 1421897598 is 8957981241.

It is a happy number.

1421897598 is a `hidden beast` number, since 1 + 42 + 1 + 8 + 9 + 7 + 598 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1421897597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4571863 + ... + 4572173.

It is an arithmetic number, because the mean of its divisors is an integer number (27799200).

Almost surely, 2^1421897598 is an apocalyptic number.

1421897598 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1421897598, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1779148800).

1421897598 is an abundant number, since it is smaller than the sum of its proper divisors (2136400002).

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

1421897598 is a wasteful number, since it uses less digits than its factorization.

1421897598 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 555 (or 549 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 54.

The square root of 1421897598 is about 37708.0574678675. The cubic root of 1421897598 is about 1124.4913184730.

The spelling of 1421897598 in words is "one billion, four hundred twenty-one million, eight hundred ninety-seven thousand, five hundred ninety-eight".