124042509 has 12 divisors (see below), whose sum is σ = 185808896. Its totient is φ = 82694844.

The previous prime is 124042493. The next prime is 124042517. The reversal of 124042509 is 905240421.

124042509 is a `hidden beast` number, since 1 + 2 + 404 + 250 + 9 = 666.

It is not a de Polignac number, because 124042509 - 2⁴ = 124042493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124042559) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 254989 + ... + 255474.

Almost surely, 2^124042509 is an apocalyptic number.

It is an amenable number.

124042509 is a deficient number, since it is larger than the sum of its proper divisors (61766387).

124042509 is an frugal number, since it uses more digits than its factorization.

124042509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510478 (or 510466 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 124042509 is about 11137.4372725506. The cubic root of 124042509 is about 498.7200716961.

The spelling of 124042509 in words is "one hundred twenty-four million, forty-two thousand, five hundred nine".