123905790 has 96 divisors (see below), whose sum is σ = 333961056. Its totient is φ = 31852800.

The previous prime is 123905767. The next prime is 123905857. The reversal of 123905790 is 97509321.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 390712 + ... + 391028.

It is an arithmetic number, because the mean of its divisors is an integer number (3478761).

Almost surely, 2^123905790 is an apocalyptic number.

123905790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 123905790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166980528).

123905790 is an abundant number, since it is smaller than the sum of its proper divisors (210055266).

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

123905790 is a wasteful number, since it uses less digits than its factorization.

123905790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 123905790 is about 11131.2977680053. The cubic root of 123905790 is about 498.5367754583.

The spelling of 123905790 in words is "one hundred twenty-three million, nine hundred five thousand, seven hundred ninety".