123891190 has 32 divisors (see below), whose sum is σ = 238152960. Its totient is φ = 46300800.

The previous prime is 123891149. The next prime is 123891193. The reversal of 123891190 is 91198321.

It is a super-2 number, since 2×123891190² = 30698053919232200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123891193) 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 15 ways as a sum of consecutive naturals, for example, 2100 + ... + 15880.

It is an arithmetic number, because the mean of its divisors is an integer number (7442280).

Almost surely, 2^123891190 is an apocalyptic number.

123891190 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123891190 is a deficient number, since it is larger than the sum of its proper divisors (114261770).

123891190 is a wasteful number, since it uses less digits than its factorization.

123891190 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13848.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 123891190 is about 11130.6419401578. The cubic root of 123891190 is about 498.5171935840.

The spelling of 123891190 in words is "one hundred twenty-three million, eight hundred ninety-one thousand, one hundred ninety".