2154009 has 16 divisors (see below), whose sum is σ = 3374784. Its totient is φ = 1204800.

The previous prime is 2154007. The next prime is 2154013. The reversal of 2154009 is 9004512.

It is not a de Polignac number, because 2154009 - 2¹ = 2154007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2154007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2082 + ... + 2939.

It is an arithmetic number, because the mean of its divisors is an integer number (210924).

2^2154009 is an apocalyptic number.

It is an amenable number.

2154009 is a deficient number, since it is larger than the sum of its proper divisors (1220775).

2154009 is a wasteful number, since it uses less digits than its factorization.

2154009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5048.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 2154009 is about 1467.6542508370. The cubic root of 2154009 is about 129.1464594588.

It can be divided in two parts, 215 and 4009, that added together give a palindrome (4224).

The spelling of 2154009 in words is "two million, one hundred fifty-four thousand, nine".