2100646 has 4 divisors (see below), whose sum is σ = 3150972. Its totient is φ = 1050322.

The previous prime is 2100629. The next prime is 2100649. The reversal of 2100646 is 6460012.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525160 + ... + 525163.

It is an arithmetic number, because the mean of its divisors is an integer number (787743).

2^2100646 is an apocalyptic number.

2100646 is a deficient number, since it is larger than the sum of its proper divisors (1050326).

2100646 is a wasteful number, since it uses less digits than its factorization.

2100646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050325.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2100646 is about 1449.3605486559. The cubic root of 2100646 is about 128.0710461706.

Adding to 2100646 its reverse (6460012), we get a palindrome (8560658).

The spelling of 2100646 in words is "two million, one hundred thousand, six hundred forty-six".