3405921 has 8 divisors (see below), whose sum is σ = 4780320. Its totient is φ = 2151072.

The previous prime is 3405907. The next prime is 3405929. The reversal of 3405921 is 1295043.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3405921 - 2⁵ = 3405889 is a prime.

It is a Curzon number.

3405921 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 3405891 and 3405900.

It is not an unprimeable number, because it can be changed into a prime (3405929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29820 + ... + 29933.

It is an arithmetic number, because the mean of its divisors is an integer number (597540).

Almost surely, 2^3405921 is an apocalyptic number.

It is an amenable number.

3405921 is a deficient number, since it is larger than the sum of its proper divisors (1374399).

3405921 is a wasteful number, since it uses less digits than its factorization.

3405921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59775.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 3405921 is about 1845.5137496101. The cubic root of 3405921 is about 150.4566969967.

The spelling of 3405921 in words is "three million, four hundred five thousand, nine hundred twenty-one".