2187406 has 8 divisors (see below), whose sum is σ = 3533544. Its totient is φ = 1009560.

The previous prime is 2187397. The next prime is 2187421. The reversal of 2187406 is 6047812.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42040 + ... + 42091.

It is an arithmetic number, because the mean of its divisors is an integer number (441693).

2^2187406 is an apocalyptic number.

2187406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2187406 is a deficient number, since it is larger than the sum of its proper divisors (1346138).

2187406 is a wasteful number, since it uses less digits than its factorization.

2187406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84146.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 2187406 is about 1478.9881676335. The cubic root of 2187406 is about 129.8104931122.

The spelling of 2187406 in words is "two million, one hundred eighty-seven thousand, four hundred six".