2109406 has 8 divisors (see below), whose sum is σ = 3407544. Its totient is φ = 973560.

The previous prime is 2109403. The next prime is 2109421. The reversal of 2109406 is 6049012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2109403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40540 + ... + 40591.

It is an arithmetic number, because the mean of its divisors is an integer number (425943).

2^2109406 is an apocalyptic number.

2109406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2109406 is a deficient number, since it is larger than the sum of its proper divisors (1298138).

2109406 is a wasteful number, since it uses less digits than its factorization.

2109406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81146.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 2109406 is about 1452.3794270093. The cubic root of 2109406 is about 128.2488242555.

It can be divided in two parts, 2 and 109406, that multiplied together give a palindrome (218812).

The spelling of 2109406 in words is "two million, one hundred nine thousand, four hundred six".