123378881 has 4 divisors (see below), whose sum is σ = 126388164. Its totient is φ = 120369600.

The previous prime is 123378863. The next prime is 123378889. The reversal of 123378881 is 188873321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 52128400 + 71250481 = 7220^2 + 8441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123378881 is a prime.

It is a super-2 number, since 2×123378881² = 30444696553624322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 3009241 = 123378881 / (1 + 2 + 3 + 3 + 7 + 8 + 8 + 8 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123378889) 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, 1504580 + ... + 1504661.

It is an arithmetic number, because the mean of its divisors is an integer number (31597041).

Almost surely, 2^123378881 is an apocalyptic number.

It is an amenable number.

123378881 is a deficient number, since it is larger than the sum of its proper divisors (3009283).

123378881 is an equidigital number, since it uses as much as digits as its factorization.

123378881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3009282.

The product of its digits is 64512, while the sum is 41.

The square root of 123378881 is about 11107.6046472676. The cubic root of 123378881 is about 497.8290959930.

The spelling of 123378881 in words is "one hundred twenty-three million, three hundred seventy-eight thousand, eight hundred eighty-one".