2636989 has 8 divisors (see below), whose sum is σ = 2810808. Its totient is φ = 2465280.

The previous prime is 2636983. The next prime is 2637001. The reversal of 2636989 is 9896362.

It can be written as a sum of positive squares in 4 ways, for example, as 511225 + 2125764 = 715^2 + 1458^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2636989 - 2⁵ = 2636957 is a prime.

It is a super-2 number, since 2×2636989² = 13907421972242, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹³ + 6 + 3¹² + 6² + 9² + 8⁷ + 9² .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2636983) 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, 2649 + ... + 3505.

It is an arithmetic number, because the mean of its divisors is an integer number (351351).

2^2636989 is an apocalyptic number.

It is an amenable number.

2636989 is a deficient number, since it is larger than the sum of its proper divisors (173819).

2636989 is a wasteful number, since it uses less digits than its factorization.

2636989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055.

The product of its digits is 139968, while the sum is 43.

The square root of 2636989 is about 1623.8808453824. The cubic root of 2636989 is about 138.1559009643.

The spelling of 2636989 in words is "two million, six hundred thirty-six thousand, nine hundred eighty-nine".