1240420028 has 12 divisors (see below), whose sum is σ = 2298425472. Its totient is φ = 583727040.

The previous prime is 1240420021. The next prime is 1240420033. The reversal of 1240420028 is 8200240421.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1240419985 and 1240420012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240420021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9120668 + ... + 9120803.

It is an arithmetic number, because the mean of its divisors is an integer number (191535456).

Almost surely, 2^1240420028 is an apocalyptic number.

It is an amenable number.

1240420028 is a deficient number, since it is larger than the sum of its proper divisors (1058005444).

1240420028 is a wasteful number, since it uses less digits than its factorization.

1240420028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18241492 (or 18241490 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 1240420028 is about 35219.5972151869. The cubic root of 1240420028 is about 1074.4583615023.

Adding to 1240420028 its reverse (8200240421), we get a palindrome (9440660449).

The spelling of 1240420028 in words is "one billion, two hundred forty million, four hundred twenty thousand, twenty-eight".