1240420201 has 4 divisors (see below), whose sum is σ = 1242190404. Its totient is φ = 1238650000.

The previous prime is 1240420169. The next prime is 1240420211. The reversal of 1240420201 is 1020240421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1020240421 = 47 ⋅21707243.

It can be written as a sum of positive squares in 2 ways, for example, as 408040000 + 832380201 = 20200^2 + 28851^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240420201 - 2⁵ = 1240420169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1240420211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 884050 + ... + 885451.

It is an arithmetic number, because the mean of its divisors is an integer number (310547601).

Almost surely, 2^1240420201 is an apocalyptic number.

It is an amenable number.

1240420201 is a deficient number, since it is larger than the sum of its proper divisors (1770203).

1240420201 is an equidigital number, since it uses as much as digits as its factorization.

1240420201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770202.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1240420201 is about 35219.5996712058. The cubic root of 1240420201 is about 1074.4584114535.

Adding to 1240420201 its reverse (1020240421), we get a palindrome (2260660622).

The spelling of 1240420201 in words is "one billion, two hundred forty million, four hundred twenty thousand, two hundred one".