2145636 has 24 divisors (see below), whose sum is σ = 5563040. Its totient is φ = 715176.

The previous prime is 2145631. The next prime is 2145641. The reversal of 2145636 is 6365412.

2145636 is a `hidden beast` number, since 21 + 4 + 5 + 636 = 666.

It is an interprime number because it is at equal distance from previous prime (2145631) and next prime (2145641).

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

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (2145631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9826 + ... + 10041.

2^2145636 is an apocalyptic number.

It is an amenable number.

2145636 is an abundant number, since it is smaller than the sum of its proper divisors (3417404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2145636 is a wasteful number, since it uses less digits than its factorization.

2145636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19880 (or 19872 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 2145636 is about 1464.7989623153. The cubic root of 2145636 is about 128.9789040679.

The spelling of 2145636 in words is "two million, one hundred forty-five thousand, six hundred thirty-six".