1200001401 has 6 divisors (see below), whose sum is σ = 1733335370. Its totient is φ = 800000928.

The previous prime is 1200001393. The next prime is 1200001403. The reversal of 1200001401 is 1041000021.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 796594176 + 403407225 = 28224^2 + 20085^2 .

It is not a de Polignac number, because 1200001401 - 2³ = 1200001393 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 133333489 = 1200001401 / (1 + 2 + 0 + 0 + 0 + 0 + 1 + 4 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200001403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66666736 + ... + 66666753.

Almost surely, 2^1200001401 is an apocalyptic number.

It is an amenable number.

1200001401 is a deficient number, since it is larger than the sum of its proper divisors (533333969).

1200001401 is a wasteful number, since it uses less digits than its factorization.

1200001401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133333495 (or 133333492 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1200001401 is about 34641.0363730648. The cubic root of 1200001401 is about 1062.6589827337.

Adding to 1200001401 its reverse (1041000021), we get a palindrome (2241001422).

The spelling of 1200001401 in words is "one billion, two hundred million, one thousand, four hundred one".