2123649 has 24 divisors (see below), whose sum is σ = 3525600. Its totient is φ = 1218240.

The previous prime is 2123617. The next prime is 2123663. The reversal of 2123649 is 9463212.

2123649 is a `hidden beast` number, since 2 + 12 + 3 + 649 = 666.

It is not a de Polignac number, because 2123649 - 2⁵ = 2123617 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 1 + 2²¹ + 3⁹ + 6³ + 4 + 9⁴ .

It is not an unprimeable number, because it can be changed into a prime (2123669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1317 + ... + 2445.

It is an arithmetic number, because the mean of its divisors is an integer number (146900).

2^2123649 is an apocalyptic number.

It is an amenable number.

2123649 is a deficient number, since it is larger than the sum of its proper divisors (1401951).

2123649 is a wasteful number, since it uses less digits than its factorization.

2123649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1165 (or 1162 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 2123649 is about 1457.2745108592. The cubic root of 2123649 is about 128.5368282556.

It can be divided in two parts, 2123 and 649, that added together give a palindrome (2772).

The spelling of 2123649 in words is "two million, one hundred twenty-three thousand, six hundred forty-nine".