1240542442 has 4 divisors (see below), whose sum is σ = 1860813666. Its totient is φ = 620271220.

The previous prime is 1240542397. The next prime is 1240542473. The reversal of 1240542442 is 2442450421.

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., 1230676561 + 9865881 = 35081^2 + 3141^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1240542442.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310135609 + ... + 310135612.

Almost surely, 2^1240542442 is an apocalyptic number.

1240542442 is a deficient number, since it is larger than the sum of its proper divisors (620271224).

1240542442 is an equidigital number, since it uses as much as digits as its factorization.

1240542442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620271223.

The product of its (nonzero) digits is 10240, while the sum is 28.

The square root of 1240542442 is about 35221.3350400010. The cubic root of 1240542442 is about 1074.4937055569.

Adding to 1240542442 its reverse (2442450421), we get a palindrome (3682992863).

The spelling of 1240542442 in words is "one billion, two hundred forty million, five hundred forty-two thousand, four hundred forty-two".