1200100042 has 4 divisors (see below), whose sum is σ = 1800150066. Its totient is φ = 600050020.

The previous prime is 1200100019. The next prime is 1200100043. The reversal of 1200100042 is 2400010021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1199306161 + 793881 = 34631^2 + 891^2 .

It is a super-2 number, since 2×1200100042² = 2880480221616803528, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1200100043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 300025009 + ... + 300025012.

Almost surely, 2^1200100042 is an apocalyptic number.

1200100042 is a deficient number, since it is larger than the sum of its proper divisors (600050024).

1200100042 is an equidigital number, since it uses as much as digits as its factorization.

1200100042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600050023.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1200100042 is about 34642.4601031740. The cubic root of 1200100042 is about 1062.6880990533.

Adding to 1200100042 its reverse (2400010021), we get a palindrome (3600110063).

The spelling of 1200100042 in words is "one billion, two hundred million, one hundred thousand, forty-two".