123878406 has 16 divisors (see below), whose sum is σ = 251956800. Its totient is φ = 40592808.

The previous prime is 123878389. The next prime is 123878407. The reversal of 123878406 is 604878321.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123878407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174616 + ... + 175323.

It is an arithmetic number, because the mean of its divisors is an integer number (15747300).

Almost surely, 2^123878406 is an apocalyptic number.

123878406 is an abundant number, since it is smaller than the sum of its proper divisors (128078394).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123878406 is a wasteful number, since it uses less digits than its factorization.

123878406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350003.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 123878406 is about 11130.0676547809. The cubic root of 123878406 is about 498.5000461096.

The spelling of 123878406 in words is "one hundred twenty-three million, eight hundred seventy-eight thousand, four hundred six".