1201400243 has 4 divisors (see below), whose sum is σ = 1209356688. Its totient is φ = 1193443800.

The previous prime is 1201400219. The next prime is 1201400269. The reversal of 1201400243 is 3420041021.

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

It is a cyclic number.

It is not a de Polignac number, because 1201400243 - 2⁸ = 1201399987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201400273) 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, 3977996 + ... + 3978297.

It is an arithmetic number, because the mean of its divisors is an integer number (302339172).

Almost surely, 2^1201400243 is an apocalyptic number.

1201400243 is a deficient number, since it is larger than the sum of its proper divisors (7956445).

1201400243 is an equidigital number, since it uses as much as digits as its factorization.

1201400243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7956444.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1201400243 is about 34661.2210258092. The cubic root of 1201400243 is about 1063.0717363599.

Adding to 1201400243 its reverse (3420041021), we get a palindrome (4621441264).

The spelling of 1201400243 in words is "one billion, two hundred one million, four hundred thousand, two hundred forty-three".