1242119905 has 8 divisors (see below), whose sum is σ = 1605201192. Its totient is φ = 917257728.

The previous prime is 1242119903. The next prime is 1242119911. The reversal of 1242119905 is 5099112421.

It can be written as a sum of positive squares in 4 ways, for example, as 29408929 + 1212710976 = 5423^2 + 34824^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1242119905 - 2¹ = 1242119903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242119903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9554704 + ... + 9554833.

It is an arithmetic number, because the mean of its divisors is an integer number (200650149).

Almost surely, 2^1242119905 is an apocalyptic number.

It is an amenable number.

1242119905 is a deficient number, since it is larger than the sum of its proper divisors (363081287).

1242119905 is a wasteful number, since it uses less digits than its factorization.

1242119905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19109555.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 1242119905 is about 35243.7214975944. The cubic root of 1242119905 is about 1074.9489516051.

The spelling of 1242119905 in words is "one billion, two hundred forty-two million, one hundred nineteen thousand, nine hundred five".