123878407 has 2 divisors, whose sum is σ = 123878408. Its totient is φ = 123878406.

The previous prime is 123878389. The next prime is 123878497. The reversal of 123878407 is 704878321.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123878407 is a prime.

It is equal to p_7049929 and since 123878407 and 7049929 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123878407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123878497) 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 as a sum of consecutive naturals, namely, 61939203 + 61939204.

It is an arithmetic number, because the mean of its divisors is an integer number (61939204).

Almost surely, 2^123878407 is an apocalyptic number.

123878407 is a deficient number, since it is larger than the sum of its proper divisors (1).

123878407 is an equidigital number, since it uses as much as digits as its factorization.

123878407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 123878407 is about 11130.0676997043. The cubic root of 123878407 is about 498.5000474509.

The spelling of 123878407 in words is "one hundred twenty-three million, eight hundred seventy-eight thousand, four hundred seven".