1421780040 has 320 divisors, whose sum is σ = 5137292160. Its totient is φ = 351406080.

The previous prime is 1421780039. The next prime is 1421780069. The reversal of 1421780040 is 400871241.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1421779986 and 1421780013.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 4571485 + ... + 4571795.

It is an arithmetic number, because the mean of its divisors is an integer number (16054038).

Almost surely, 2^1421780040 is an apocalyptic number.

1421780040 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 1421780040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2568646080).

1421780040 is an abundant number, since it is smaller than the sum of its proper divisors (3715512120).

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

1421780040 is a wasteful number, since it uses less digits than its factorization.

1421780040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 1421780040 is about 37706.4986441330. The cubic root of 1421780040 is about 1124.4603278227.

The spelling of 1421780040 in words is "one billion, four hundred twenty-one million, seven hundred eighty thousand, forty".