1440000155 has 16 divisors (see below), whose sum is σ = 1931071968. Its totient is φ = 1021728000.

The previous prime is 1440000143. The next prime is 1440000157. The reversal of 1440000155 is 5510000441.

It is not a de Polignac number, because 1440000155 - 2¹⁰ = 1439999131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1440000157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 317036 + ... + 321545.

It is an arithmetic number, because the mean of its divisors is an integer number (120691998).

Almost surely, 2^1440000155 is an apocalyptic number.

1440000155 is a deficient number, since it is larger than the sum of its proper divisors (491071813).

1440000155 is a wasteful number, since it uses less digits than its factorization.

1440000155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638638.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1440000155 is about 37947.3339643248. Note that the first 3 decimals coincide. The cubic root of 1440000155 is about 1129.2432751741.

Adding to 1440000155 its reverse (5510000441), we get a palindrome (6950000596).

The spelling of 1440000155 in words is "one billion, four hundred forty million, one hundred fifty-five", and thus it is an aban number.