2129506 has 4 divisors (see below), whose sum is σ = 3194262. Its totient is φ = 1064752.

The previous prime is 2129497. The next prime is 2129507. The reversal of 2129506 is 6059212.

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

It can be written as a sum of positive squares in only one way, i.e., 1713481 + 416025 = 1309^2 + 645^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2129507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 532375 + ... + 532378.

2^2129506 is an apocalyptic number.

2129506 is a deficient number, since it is larger than the sum of its proper divisors (1064756).

2129506 is a wasteful number, since it uses less digits than its factorization.

2129506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064755.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 2129506 is about 1459.2827005073. The cubic root of 2129506 is about 128.6548874944.

The spelling of 2129506 in words is "two million, one hundred twenty-nine thousand, five hundred six".