2152409 has 16 divisors (see below), whose sum is σ = 2661120. Its totient is φ = 1700160.

The previous prime is 2152399. The next prime is 2152427. The reversal of 2152409 is 9042512.

It is not a de Polignac number, because 2152409 - 2⁴ = 2152393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2152429) 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, 4439 + ... + 4899.

It is an arithmetic number, because the mean of its divisors is an integer number (166320).

2^2152409 is an apocalyptic number.

2152409 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2152409 is a deficient number, since it is larger than the sum of its proper divisors (508711).

2152409 is a wasteful number, since it uses less digits than its factorization.

2152409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 2152409 is about 1467.1090620673. The cubic root of 2152409 is about 129.1144748325.

The spelling of 2152409 in words is "two million, one hundred fifty-two thousand, four hundred nine".