1210400042 has 4 divisors (see below), whose sum is σ = 1815600066. Its totient is φ = 605200020.

The previous prime is 1210400029. The next prime is 1210400063. The reversal of 1210400042 is 2400040121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2400040121 = 7523 ⋅319027.

It can be written as a sum of positive squares in only one way, i.e., 1169708401 + 40691641 = 34201^2 + 6379^2 .

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 as a sum of consecutive naturals, namely, 302600009 + ... + 302600012.

Almost surely, 2^1210400042 is an apocalyptic number.

1210400042 is a deficient number, since it is larger than the sum of its proper divisors (605200024).

1210400042 is an equidigital number, since it uses as much as digits as its factorization.

1210400042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605200023.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1210400042 is about 34790.8039861110. The cubic root of 1210400042 is about 1065.7196578906.

Adding to 1210400042 its reverse (2400040121), we get a palindrome (3610440163).

The spelling of 1210400042 in words is "one billion, two hundred ten million, four hundred thousand, forty-two".