1242111440 has 20 divisors (see below), whose sum is σ = 2887909284. Its totient is φ = 496844544.

The previous prime is 1242111421. The next prime is 1242111457. The reversal of 1242111440 is 441112421.

It can be written as a sum of positive squares in 2 ways, for example, as 640292416 + 601819024 = 25304^2 + 24532^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7763117 + ... + 7763276.

Almost surely, 2^1242111440 is an apocalyptic number.

1242111440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1242111440 is an abundant number, since it is smaller than the sum of its proper divisors (1645797844).

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

1242111440 is a wasteful number, since it uses less digits than its factorization.

1242111440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15526406 (or 15526400 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 1242111440 is about 35243.6014050778. The cubic root of 1242111440 is about 1074.9465096875.

Adding to 1242111440 its reverse (441112421), we get a palindrome (1683223861).

The spelling of 1242111440 in words is "one billion, two hundred forty-two million, one hundred eleven thousand, four hundred forty".