1242457125 has 128 divisors (see below), whose sum is σ = 2656862208. Its totient is φ = 501177600.

The previous prime is 1242457103. The next prime is 1242457127. The reversal of 1242457125 is 5217542421.

It is not a de Polignac number, because 1242457125 - 2¹⁷ = 1242326053 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242457127) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 784084 + ... + 785666.

It is an arithmetic number, because the mean of its divisors is an integer number (20756736).

Almost surely, 2^1242457125 is an apocalyptic number.

1242457125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1242457125 is an abundant number, since it is smaller than the sum of its proper divisors (1414405083).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1242457125 is a wasteful number, since it uses less digits than its factorization.

1242457125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1644 (or 1634 counting only the distinct ones).

The product of its digits is 22400, while the sum is 33.

The square root of 1242457125 is about 35248.5052874586. The cubic root of 1242457125 is about 1075.0462211963.

Adding to 1242457125 its reverse (5217542421), we get a palindrome (6459999546).

The spelling of 1242457125 in words is "one billion, two hundred forty-two million, four hundred fifty-seven thousand, one hundred twenty-five".