3405720 has 64 divisors (see below), whose sum is σ = 10355040. Its totient is φ = 896000.

The previous prime is 3405713. The next prime is 3405737. The reversal of 3405720 is 275043.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11980 + ... + 12260.

Almost surely, 2^3405720 is an apocalyptic number.

3405720 is a gapful number since it is divisible by the number (30) 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 3405720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5177520).

3405720 is an abundant number, since it is smaller than the sum of its proper divisors (6949320).

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

3405720 is a wasteful number, since it uses less digits than its factorization.

3405720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396 (or 392 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 21.

The square root of 3405720 is about 1845.4592924256. The cubic root of 3405720 is about 150.4537372108.

The spelling of 3405720 in words is "three million, four hundred five thousand, seven hundred twenty".