123997799 has 4 divisors (see below), whose sum is σ = 127997760. Its totient is φ = 119997840.

The previous prime is 123997759. The next prime is 123997829. The reversal of 123997799 is 997799321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123997799 - 2⁸ = 123997543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123997759) 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, 1999934 + ... + 1999995.

It is an arithmetic number, because the mean of its divisors is an integer number (31999440).

Almost surely, 2^123997799 is an apocalyptic number.

123997799 is a deficient number, since it is larger than the sum of its proper divisors (3999961).

123997799 is an equidigital number, since it uses as much as digits as its factorization.

123997799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3999960.

The product of its digits is 1928934, while the sum is 56.

The square root of 123997799 is about 11135.4298974041. The cubic root of 123997799 is about 498.6601447831.

The spelling of 123997799 in words is "one hundred twenty-three million, nine hundred ninety-seven thousand, seven hundred ninety-nine".