126240421 has 8 divisors (see below), whose sum is σ = 127820000. Its totient is φ = 124668720.

The previous prime is 126240409. The next prime is 126240437. The reversal of 126240421 is 124042621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126240421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 126240392 and 126240401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126240461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34330 + ... + 37828.

It is an arithmetic number, because the mean of its divisors is an integer number (15977500).

Almost surely, 2^126240421 is an apocalyptic number.

It is an amenable number.

126240421 is a deficient number, since it is larger than the sum of its proper divisors (1579579).

126240421 is a wasteful number, since it uses less digits than its factorization.

126240421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3939.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 126240421 is about 11235.6762591310. The cubic root of 126240421 is about 501.6484538935.

The spelling of 126240421 in words is "one hundred twenty-six million, two hundred forty thousand, four hundred twenty-one".