1420981380 has 648 divisors, whose sum is σ = 5936957208. Its totient is φ = 282175488.

The previous prime is 1420981361. The next prime is 1420981417. The reversal of 1420981380 is 831890241.

It can be written as a sum of positive squares in 4 ways, for example, as 104162436 + 1316818944 = 10206^2 + 36288^2 .

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

It is a congruent number.

It is an unprimeable number.

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 215 ways as a sum of consecutive naturals, for example, 83587132 + ... + 83587148.

It is an arithmetic number, because the mean of its divisors is an integer number (9161971).

Almost surely, 2^1420981380 is an apocalyptic number.

1420981380 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 1420981380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2968478604).

1420981380 is an abundant number, since it is smaller than the sum of its proper divisors (4515975828).

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

1420981380 is a wasteful number, since it uses less digits than its factorization.

1420981380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 1420981380 is about 37695.9066743327. The cubic root of 1420981380 is about 1124.2497397642.

The spelling of 1420981380 in words is "one billion, four hundred twenty million, nine hundred eighty-one thousand, three hundred eighty".