2154906 has 24 divisors (see below), whose sum is σ = 5028660. Its totient is φ = 662976.

The previous prime is 2154899. The next prime is 2154907. The reversal of 2154906 is 6094512.

It can be written as a sum of positive squares in 2 ways, for example, as 1846881 + 308025 = 1359^2 + 555^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2154906.

It is not an unprimeable number, because it can be changed into a prime (2154907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4371 + ... + 4838.

2^2154906 is an apocalyptic number.

2154906 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2154906 is an abundant number, since it is smaller than the sum of its proper divisors (2873754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2154906 is a wasteful number, since it uses less digits than its factorization.

2154906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9230 (or 9227 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 2154906 is about 1467.9598087141. The cubic root of 2154906 is about 129.1643839116.

It can be divided in two parts, 215490 and 6, that added together give a triangular number (215496 = T₆₅₆).

The spelling of 2154906 in words is "two million, one hundred fifty-four thousand, nine hundred six".