123456790 has 16 divisors (see below), whose sum is σ = 228228912.
Its totient is φ = 48047904.
The previous prime is 123456761. The next prime is 123456791. The reversal of 123456790 is 97654321.
It is a Harshad number since it is a multiple of its sum of digits (37).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (123456791) 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, 166464 + ... + 167203.
It is an arithmetic number, because the mean of its divisors is an integer number (14264307).
Almost surely, 2123456790 is an apocalyptic number.
123456790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
123456790 is a deficient number, since it is larger than the sum of its proper divisors (104772122).
123456790 is a wasteful number, since it uses less digits than its factorization.
123456790 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 333711.
The product of its (nonzero) digits is 45360, while the sum is 37.
The square root of 123456790 is about 11111.1111055556.
Note that the first 4 decimals coincide.
The cubic root of 123456790 is about 497.9338605626.
The spelling of 123456790 in words is "one hundred twenty-three million, four hundred fifty-six thousand, seven hundred ninety".