123210987 has 4 divisors (see below), whose sum is σ = 164281320. Its totient is φ = 82140656.

The previous prime is 123210979. The next prime is 123211001. The reversal of 123210987 is 789012321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123210987 - 2³ = 123210979 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (123210487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20535162 + ... + 20535167.

It is an arithmetic number, because the mean of its divisors is an integer number (41070330).

Almost surely, 2^123210987 is an apocalyptic number.

123210987 is a deficient number, since it is larger than the sum of its proper divisors (41070333).

123210987 is an equidigital number, since it uses as much as digits as its factorization.

123210987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41070332.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 123210987 is about 11100.0444593704. The cubic root of 123210987 is about 497.6031781826.

The spelling of 123210987 in words is "one hundred twenty-three million, two hundred ten thousand, nine hundred eighty-seven".