1240142242 has 4 divisors (see below), whose sum is σ = 1860213366. Its totient is φ = 620071120.

The previous prime is 1240142227. The next prime is 1240142263. The reversal of 1240142242 is 2422410421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1224230121 + 15912121 = 34989^2 + 3989^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310035559 + ... + 310035562.

Almost surely, 2^1240142242 is an apocalyptic number.

1240142242 is a deficient number, since it is larger than the sum of its proper divisors (620071124).

1240142242 is an equidigital number, since it uses as much as digits as its factorization.

1240142242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620071123.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 1240142242 is about 35215.6533660814. The cubic root of 1240142242 is about 1074.3781489489.

Adding to 1240142242 its reverse (2422410421), we get a palindrome (3662552663).

The spelling of 1240142242 in words is "one billion, two hundred forty million, one hundred forty-two thousand, two hundred forty-two".