123778825 has 12 divisors (see below), whose sum is σ = 161564560. Its totient is φ = 93810960.

The previous prime is 123778807. The next prime is 123778829. The reversal of 123778825 is 528877321.

It is not a de Polignac number, because 123778825 - 2⁵ = 123778793 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (123778829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129819 + ... + 130768.

Almost surely, 2^123778825 is an apocalyptic number.

It is an amenable number.

123778825 is a deficient number, since it is larger than the sum of its proper divisors (37785735).

123778825 is a wasteful number, since it uses less digits than its factorization.

123778825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260616 (or 260611 counting only the distinct ones).

The product of its digits is 188160, while the sum is 43.

The square root of 123778825 is about 11125.5932426096. The cubic root of 123778825 is about 498.3664354124.

The spelling of 123778825 in words is "one hundred twenty-three million, seven hundred seventy-eight thousand, eight hundred twenty-five".