1242634557 has 8 divisors (see below), whose sum is σ = 1660250176. Its totient is φ = 826720992.

The previous prime is 1242634537. The next prime is 1242634559. The reversal of 1242634557 is 7554362421.

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

It is not a de Polignac number, because 1242634557 - 2⁸ = 1242634301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242634559) 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, 423808 + ... + 426729.

It is an arithmetic number, because the mean of its divisors is an integer number (207531272).

Almost surely, 2^1242634557 is an apocalyptic number.

It is an amenable number.

1242634557 is a deficient number, since it is larger than the sum of its proper divisors (417615619).

1242634557 is an equidigital number, since it uses as much as digits as its factorization.

1242634557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851027.

The product of its digits is 201600, while the sum is 39.

The square root of 1242634557 is about 35251.0220702890. The cubic root of 1242634557 is about 1075.0973935917.

Adding to 1242634557 its reverse (7554362421), we get a palindrome (8796996978).

The spelling of 1242634557 in words is "one billion, two hundred forty-two million, six hundred thirty-four thousand, five hundred fifty-seven".