102123999 has 6 divisors (see below), whose sum is σ = 147512456. Its totient is φ = 68082660.

The previous prime is 102123977. The next prime is 102124037. The reversal of 102123999 is 999321201.

It is a happy number.

It is not a de Polignac number, because 102123999 - 2⁹ = 102123487 is a prime.

It is a super-2 number, since 2×102123999² = 20858622343504002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102123929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5673547 + ... + 5673564.

Almost surely, 2^102123999 is an apocalyptic number.

102123999 is a deficient number, since it is larger than the sum of its proper divisors (45388457).

102123999 is a wasteful number, since it uses less digits than its factorization.

102123999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11347117 (or 11347114 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 102123999 is about 10105.6419390358. The cubic root of 102123999 is about 467.4221308340.

The spelling of 102123999 in words is "one hundred two million, one hundred twenty-three thousand, nine hundred ninety-nine".