123456787 has 6 divisors (see below), whose sum is σ = 127568724. Its totient is φ = 119473380.

The previous prime is 123456761. The next prime is 123456791. The reversal of 123456787 is 787654321.

123456787 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 123456787 - 2²³ = 115068179 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123456757) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63273 + ... + 65194.

It is an arithmetic number, because the mean of its divisors is an integer number (21261454).

Almost surely, 2^123456787 is an apocalyptic number.

123456787 is a deficient number, since it is larger than the sum of its proper divisors (4111937).

123456787 is an equidigital number, since it uses as much as digits as its factorization.

123456787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128529 (or 128498 counting only the distinct ones).

The product of its digits is 282240, while the sum is 43.

The square root of 123456787 is about 11111.1109705556. The cubic root of 123456787 is about 497.9338565293.

The spelling of 123456787 in words is "one hundred twenty-three million, four hundred fifty-six thousand, seven hundred eighty-seven".