2123739 has 20 divisors (see below), whose sum is σ = 3211824. Its totient is φ = 1398384.

The previous prime is 2123731. The next prime is 2123741. The reversal of 2123739 is 9373212.

It is not a de Polignac number, because 2123739 - 2³ = 2123731 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2123731) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 12634 + ... + 12800.

2^2123739 is an apocalyptic number.

2123739 is a deficient number, since it is larger than the sum of its proper divisors (1088085).

2123739 is a wasteful number, since it uses less digits than its factorization.

2123739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 327 counting only the distinct ones).

The product of its digits is 2268, while the sum is 27.

The square root of 2123739 is about 1457.3053900950. The cubic root of 2123739 is about 128.5386440219.

The spelling of 2123739 in words is "two million, one hundred twenty-three thousand, seven hundred thirty-nine".