1200040001 has 4 divisors (see below), whose sum is σ = 1227947952. Its totient is φ = 1172132052.

The previous prime is 1200039991. The next prime is 1200040003. The reversal of 1200040001 is 1000400021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1200040001 - 2²² = 1195845697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1200040003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13953911 + ... + 13953996.

It is an arithmetic number, because the mean of its divisors is an integer number (306986988).

Almost surely, 2^1200040001 is an apocalyptic number.

It is an amenable number.

1200040001 is a deficient number, since it is larger than the sum of its proper divisors (27907951).

1200040001 is an equidigital number, since it uses as much as digits as its factorization.

1200040001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27907950.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1200040001 is about 34641.5935112691. The cubic root of 1200040001 is about 1062.6703766640.

Adding to 1200040001 its reverse (1000400021), we get a palindrome (2200440022).

It can be divided in two parts, 1 and 200040001, that added together give a palindrome (200040002).

The spelling of 1200040001 in words is "one billion, two hundred million, forty thousand, one".