1242134405 has 8 divisors (see below), whose sum is σ = 1569012000. Its totient is φ = 941407056.

The previous prime is 1242134353. The next prime is 1242134419. The reversal of 1242134405 is 5044312421.

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-1242134405 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6537455 + ... + 6537644.

It is an arithmetic number, because the mean of its divisors is an integer number (196126500).

Almost surely, 2^1242134405 is an apocalyptic number.

It is an amenable number.

1242134405 is a deficient number, since it is larger than the sum of its proper divisors (326877595).

1242134405 is a wasteful number, since it uses less digits than its factorization.

1242134405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13075123.

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

The square root of 1242134405 is about 35243.9272073928. The cubic root of 1242134405 is about 1074.9531344270.

Adding to 1242134405 its reverse (5044312421), we get a palindrome (6286446826).

The spelling of 1242134405 in words is "one billion, two hundred forty-two million, one hundred thirty-four thousand, four hundred five".