12900042 has 24 divisors (see below), whose sum is σ = 29594916. Its totient is φ = 4046976.

The previous prime is 12900011. The next prime is 12900047. The reversal of 12900042 is 24000921.

12900042 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12895281 + 4761 = 3591^2 + 69^2 .

It is a super-2 number, since 2×12900042² = 332822167203528, 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 = 12899988 and 12900024.

It is not an unprimeable number, because it can be changed into a prime (12900047) 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, 20773 + ... + 21384.

Almost surely, 2^12900042 is an apocalyptic number.

12900042 is an abundant number, since it is smaller than the sum of its proper divisors (16694874).

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

12900042 is a wasteful number, since it uses less digits than its factorization.

12900042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42182 (or 42179 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 12900042 is about 3591.6628460923. The cubic root of 12900042 is about 234.5292644150.

Adding to 12900042 its reverse (24000921), we get a palindrome (36900963).

The spelling of 12900042 in words is "twelve million, nine hundred thousand, forty-two".