2180649 has 16 divisors (see below), whose sum is σ = 3111680. Its totient is φ = 1354320.

The previous prime is 2180627. The next prime is 2180677. The reversal of 2180649 is 9460812.

It is not a de Polignac number, because 2180649 - 2⁸ = 2180393 is a prime.

It is a super-2 number, since 2×2180649² = 9510460122402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2180149) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3534 + ... + 4104.

It is an arithmetic number, because the mean of its divisors is an integer number (194480).

2^2180649 is an apocalyptic number.

It is an amenable number.

2180649 is a deficient number, since it is larger than the sum of its proper divisors (931031).

2180649 is a wasteful number, since it uses less digits than its factorization.

2180649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 2180649 is about 1476.7020688006. The cubic root of 2180649 is about 129.6766916719.

The spelling of 2180649 in words is "two million, one hundred eighty thousand, six hundred forty-nine".