2001400155 has 12 divisors (see below), whose sum is σ = 3469093680. Its totient is φ = 1067413392.

The previous prime is 2001400153. The next prime is 2001400211. The reversal of 2001400155 is 5510041002.

It is not a de Polignac number, because 2001400155 - 2¹ = 2001400153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2001400153) 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 11 ways as a sum of consecutive naturals, for example, 22237735 + ... + 22237824.

It is an arithmetic number, because the mean of its divisors is an integer number (289091140).

Almost surely, 2^2001400155 is an apocalyptic number.

2001400155 is a deficient number, since it is larger than the sum of its proper divisors (1467693525).

2001400155 is a wasteful number, since it uses less digits than its factorization.

2001400155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44475570 (or 44475567 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 2001400155 is about 44737.0110199597. The cubic root of 2001400155 is about 1260.2149954369.

Adding to 2001400155 its reverse (5510041002), we get a palindrome (7511441157).

The spelling of 2001400155 in words is "two billion, one million, four hundred thousand, one hundred fifty-five".