123101990 has 16 divisors (see below), whose sum is σ = 241727760. Its totient is φ = 44764320.

The previous prime is 123101971. The next prime is 123101999. The reversal of 123101990 is 99101321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123101999) 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, 559445 + ... + 559664.

It is an arithmetic number, because the mean of its divisors is an integer number (15107985).

Almost surely, 2^123101990 is an apocalyptic number.

123101990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

123101990 is a deficient number, since it is larger than the sum of its proper divisors (118625770).

123101990 is a wasteful number, since it uses less digits than its factorization.

123101990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119127.

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 123101990 is about 11095.1336179426. The cubic root of 123101990 is about 497.4564021625.

The spelling of 123101990 in words is "one hundred twenty-three million, one hundred one thousand, nine hundred ninety".