123158440 has 32 divisors (see below), whose sum is σ = 278369280. Its totient is φ = 49038912.

The previous prime is 123158423. The next prime is 123158449. The reversal of 123158440 is 44851321.

It is a junction number, because it is equal to n+sod(n) for n = 123158399 and 123158408.

It is not an unprimeable number, because it can be changed into a prime (123158449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2017 + ... + 15823.

It is an arithmetic number, because the mean of its divisors is an integer number (8699040).

Almost surely, 2^123158440 is an apocalyptic number.

123158440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123158440 is an abundant number, since it is smaller than the sum of its proper divisors (155210840).

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

123158440 is a wasteful number, since it uses less digits than its factorization.

123158440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14041 (or 14037 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 123158440 is about 11097.6772344487. The cubic root of 123158440 is about 497.5324288853.

The spelling of 123158440 in words is "one hundred twenty-three million, one hundred fifty-eight thousand, four hundred forty".