126405242 has 8 divisors (see below), whose sum is σ = 190992276. Its totient is φ = 62741152.

The previous prime is 126405241. The next prime is 126405269. The reversal of 126405242 is 242504621.

It can be written as a sum of positive squares in 2 ways, for example, as 125462401 + 942841 = 11201^2 + 971^2 .

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

It is not an unprimeable number, because it can be changed into a prime (126405241) 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, 230393 + ... + 230940.

Almost surely, 2^126405242 is an apocalyptic number.

126405242 is a deficient number, since it is larger than the sum of its proper divisors (64587034).

126405242 is a wasteful number, since it uses less digits than its factorization.

126405242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461472.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 126405242 is about 11243.0085831151. The cubic root of 126405242 is about 501.8666783513.

Adding to 126405242 its reverse (242504621), we get a palindrome (368909863).

The spelling of 126405242 in words is "one hundred twenty-six million, four hundred five thousand, two hundred forty-two".