124220409 has 4 divisors (see below), whose sum is σ = 165627216. Its totient is φ = 82813604.

The previous prime is 124220399. The next prime is 124220419. The reversal of 124220409 is 904022421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (124220399) and next prime (124220419).

It is a cyclic number.

It is not a de Polignac number, because 124220409 - 2⁷ = 124220281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (124220419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20703399 + ... + 20703404.

It is an arithmetic number, because the mean of its divisors is an integer number (41406804).

Almost surely, 2^124220409 is an apocalyptic number.

It is an amenable number.

124220409 is a deficient number, since it is larger than the sum of its proper divisors (41406807).

124220409 is an equidigital number, since it uses as much as digits as its factorization.

124220409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41406806.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 124220409 is about 11145.4209880112. The cubic root of 124220409 is about 498.9583768827.

The spelling of 124220409 in words is "one hundred twenty-four million, two hundred twenty thousand, four hundred nine".