2173739 has 4 divisors (see below), whose sum is σ = 2301624. Its totient is φ = 2045856.

The previous prime is 2173729. The next prime is 2173747. The reversal of 2173739 is 9373712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2173739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2173729) 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, 63917 + ... + 63950.

It is an arithmetic number, because the mean of its divisors is an integer number (575406).

2^2173739 is an apocalyptic number.

2173739 is a deficient number, since it is larger than the sum of its proper divisors (127885).

2173739 is a wasteful number, since it uses less digits than its factorization.

2173739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127884.

The product of its digits is 7938, while the sum is 32.

The square root of 2173739 is about 1474.3605393526. The cubic root of 2173739 is about 129.5395743752.

The spelling of 2173739 in words is "two million, one hundred seventy-three thousand, seven hundred thirty-nine".