123378993 has 6 divisors (see below), whose sum is σ = 178214114. Its totient is φ = 82252656.

The previous prime is 123378967. The next prime is 123379001. The reversal of 123378993 is 399873321.

It can be written as a sum of positive squares in only one way, i.e., 79977249 + 43401744 = 8943^2 + 6588^2 .

It is not a de Polignac number, because 123378993 - 2¹⁷ = 123247921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123373993) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6854380 + ... + 6854397.

Almost surely, 2^123378993 is an apocalyptic number.

It is an amenable number.

123378993 is a deficient number, since it is larger than the sum of its proper divisors (54835121).

123378993 is a wasteful number, since it uses less digits than its factorization.

123378993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13708783 (or 13708780 counting only the distinct ones).

The product of its digits is 244944, while the sum is 45.

The square root of 123378993 is about 11107.6096888575. The cubic root of 123378993 is about 497.8292466316.

The spelling of 123378993 in words is "one hundred twenty-three million, three hundred seventy-eight thousand, nine hundred ninety-three".