2643538 has 4 divisors (see below), whose sum is σ = 3965310. Its totient is φ = 1321768.

The previous prime is 2643523. The next prime is 2643547. The reversal of 2643538 is 8353462.

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., 2634129 + 9409 = 1623^2 + 97^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660883 + ... + 660886.

2^2643538 is an apocalyptic number.

2643538 is a deficient number, since it is larger than the sum of its proper divisors (1321772).

2643538 is a wasteful number, since it uses less digits than its factorization.

2643538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321771.

The product of its digits is 17280, while the sum is 31.

The square root of 2643538 is about 1625.8960606386. The cubic root of 2643538 is about 138.2701771348.

The spelling of 2643538 in words is "two million, six hundred forty-three thousand, five hundred thirty-eight".