123778906 has 8 divisors (see below), whose sum is σ = 185787360. Its totient is φ = 61849788.

The previous prime is 123778891. The next prime is 123778913. The reversal of 123778906 is 609877321.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 15766 + ... + 22273.

It is an arithmetic number, because the mean of its divisors is an integer number (23223420).

Almost surely, 2^123778906 is an apocalyptic number.

123778906 is a deficient number, since it is larger than the sum of its proper divisors (62008454).

123778906 is a wasteful number, since it uses less digits than its factorization.

123778906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39668.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 123778906 is about 11125.5968828643. The cubic root of 123778906 is about 498.3665441216.

The spelling of 123778906 in words is "one hundred twenty-three million, seven hundred seventy-eight thousand, nine hundred six".