123479999 has 4 divisors (see below), whose sum is σ = 127737960. Its totient is φ = 119222040.

The previous prime is 123479971. The next prime is 123480023. The reversal of 123479999 is 999974321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999974321 = 37 ⋅27026333.

It is a cyclic number.

It is not a de Polignac number, because 123479999 - 2¹² = 123475903 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 123479999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123479929) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2128937 + ... + 2128994.

It is an arithmetic number, because the mean of its divisors is an integer number (31934490).

Almost surely, 2^123479999 is an apocalyptic number.

123479999 is a deficient number, since it is larger than the sum of its proper divisors (4257961).

123479999 is an equidigital number, since it uses as much as digits as its factorization.

123479999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4257960.

The product of its digits is 1102248, while the sum is 53.

The square root of 123479999 is about 11112.1554614755. The cubic root of 123479999 is about 497.9650612844.

The spelling of 123479999 in words is "one hundred twenty-three million, four hundred seventy-nine thousand, nine hundred ninety-nine".