123173490 has 64 divisors (see below), whose sum is σ = 325140480. Its totient is φ = 29615040.

The previous prime is 123173489. The next prime is 123173497. The reversal of 123173490 is 94371321.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (123173497) 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 31 ways as a sum of consecutive naturals, for example, 40441 + ... + 43379.

It is an arithmetic number, because the mean of its divisors is an integer number (5080320).

Almost surely, 2^123173490 is an apocalyptic number.

123173490 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 123173490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162570240).

123173490 is an abundant number, since it is smaller than the sum of its proper divisors (201966990).

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

123173490 is a wasteful number, since it uses less digits than its factorization.

123173490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3087.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 123173490 is about 11098.3552835544. The cubic root of 123173490 is about 497.5526942662.

The spelling of 123173490 in words is "one hundred twenty-three million, one hundred seventy-three thousand, four hundred ninety".