2158406 has 12 divisors (see below), whose sum is σ = 3348396. Its totient is φ = 1043460.

The previous prime is 2158393. The next prime is 2158423. The reversal of 2158406 is 6048512.

2158406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1361 + ... + 2483.

It is an arithmetic number, because the mean of its divisors is an integer number (279033).

2^2158406 is an apocalyptic number.

2158406 is a deficient number, since it is larger than the sum of its proper divisors (1189990).

2158406 is a wasteful number, since it uses less digits than its factorization.

2158406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187 (or 1156 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 2158406 is about 1469.1514557730. The cubic root of 2158406 is about 129.2342757167.

The spelling of 2158406 in words is "two million, one hundred fifty-eight thousand, four hundred six".