1242400122 has 24 divisors (see below), whose sum is σ = 2757523860. Its totient is φ = 404032320.

The previous prime is 1242400087. The next prime is 1242400129. The reversal of 1242400122 is 2210042421.

1242400122 is a `hidden beast` number, since 1 + 242 + 400 + 1 + 22 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1186733601 + 55666521 = 34449^2 + 7461^2 .

It is a super-2 number, since 2×1242400122² = 3087116126291229768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1242400095 and 1242400104.

It is not an unprimeable number, because it can be changed into a prime (1242400129) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 840997 + ... + 842472.

Almost surely, 2^1242400122 is an apocalyptic number.

1242400122 is an abundant number, since it is smaller than the sum of its proper divisors (1515123738).

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

1242400122 is a wasteful number, since it uses less digits than its factorization.

1242400122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1683518 (or 1683515 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 1242400122 is about 35247.6966907059. The cubic root of 1242400122 is about 1075.0297801737.

Adding to 1242400122 its reverse (2210042421), we get a palindrome (3452442543).

The spelling of 1242400122 in words is "one billion, two hundred forty-two million, four hundred thousand, one hundred twenty-two".