1240042020 has 72 divisors (see below), whose sum is σ = 4039003584. Its totient is φ = 283437504.

The previous prime is 1240042009. The next prime is 1240042039. The reversal of 1240042020 is 202400421.

It is a super-2 number, since 2×1240042020² = 3075408422731360800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 207952 + ... + 213831.

It is an arithmetic number, because the mean of its divisors is an integer number (56097272).

Almost surely, 2^1240042020 is an apocalyptic number.

1240042020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1240042020 is an abundant number, since it is smaller than the sum of its proper divisors (2798961564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1240042020 is a wasteful number, since it uses less digits than its factorization.

1240042020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421809 (or 421800 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 1240042020 is about 35214.2303621703. The cubic root of 1240042020 is about 1074.3492062400.

Adding to 1240042020 its reverse (202400421), we get a palindrome (1442442441).

The spelling of 1240042020 in words is "one billion, two hundred forty million, forty-two thousand, twenty".