2115406 has 4 divisors (see below), whose sum is σ = 3173112. Its totient is φ = 1057702.

The previous prime is 2115397. The next prime is 2115427. The reversal of 2115406 is 6045112.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 528850 + ... + 528853.

It is an arithmetic number, because the mean of its divisors is an integer number (793278).

2^2115406 is an apocalyptic number.

2115406 is a deficient number, since it is larger than the sum of its proper divisors (1057706).

2115406 is a wasteful number, since it uses less digits than its factorization.

2115406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057705.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2115406 is about 1454.4435362021. The cubic root of 2115406 is about 128.3703062452.

The spelling of 2115406 in words is "two million, one hundred fifteen thousand, four hundred six".