8409780 has 72 divisors (see below), whose sum is σ = 26863200. Its totient is φ = 2123712.

The previous prime is 8409721. The next prime is 8409829. The reversal of 8409780 is 879048.

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

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2191 + ... + 4649.

It is an arithmetic number, because the mean of its divisors is an integer number (373100).

Almost surely, 2^8409780 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 8409780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13431600).

8409780 is an abundant number, since it is smaller than the sum of its proper divisors (18453420).

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

8409780 is a wasteful number, since it uses less digits than its factorization.

8409780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2493 (or 2488 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 8409780 is about 2899.9620687175. The cubic root of 8409780 is about 203.3581324825.

The spelling of 8409780 in words is "eight million, four hundred nine thousand, seven hundred eighty".