2154709 has 4 divisors (see below), whose sum is σ = 2248416. Its totient is φ = 2061004.

The previous prime is 2154707. The next prime is 2154727. The reversal of 2154709 is 9074512.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2154709 - 2¹ = 2154707 is a prime.

It is a Duffinian number.

2154709 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46819 + ... + 46864.

It is an arithmetic number, because the mean of its divisors is an integer number (562104).

2^2154709 is an apocalyptic number.

It is an amenable number.

2154709 is a deficient number, since it is larger than the sum of its proper divisors (93707).

2154709 is an equidigital number, since it uses as much as digits as its factorization.

2154709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93706.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 2154709 is about 1467.8927072508. The cubic root of 2154709 is about 129.1604477524.

The spelling of 2154709 in words is "two million, one hundred fifty-four thousand, seven hundred nine".