2123540887 has 16 divisors (see below), whose sum is σ = 2339205120. Its totient is φ = 1915481952.

The previous prime is 2123540869. The next prime is 2123540933. The reversal of 2123540887 is 7880453212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2123540887 - 2⁷ = 2123540759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123540387) 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, 449178 + ... + 453880.

It is an arithmetic number, because the mean of its divisors is an integer number (146200320).

Almost surely, 2^2123540887 is an apocalyptic number.

2123540887 is a deficient number, since it is larger than the sum of its proper divisors (215664233).

2123540887 is a wasteful number, since it uses less digits than its factorization.

2123540887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5502.

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 2123540887 is about 46081.8932662277. The cubic root of 2123540887 is about 1285.3464698832.

The spelling of 2123540887 in words is "two billion, one hundred twenty-three million, five hundred forty thousand, eight hundred eighty-seven".