123406765 has 4 divisors (see below), whose sum is σ = 148088124. Its totient is φ = 98725408.

The previous prime is 123406747. The next prime is 123406781. The reversal of 123406765 is 567604321.

It is a happy number.

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 18610596 + 104796169 = 4314^2 + 10237^2 .

It is a cyclic number.

It is not a de Polignac number, because 123406765 - 2⁷ = 123406637 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123406765.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12340672 + ... + 12340681.

It is an arithmetic number, because the mean of its divisors is an integer number (37022031).

Almost surely, 2^123406765 is an apocalyptic number.

It is an amenable number.

123406765 is a deficient number, since it is larger than the sum of its proper divisors (24681359).

123406765 is an equidigital number, since it uses as much as digits as its factorization.

123406765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24681358.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 123406765 is about 11108.8597524678. The cubic root of 123406765 is about 497.8665967948.

The spelling of 123406765 in words is "one hundred twenty-three million, four hundred six thousand, seven hundred sixty-five".