1440040161 has 16 divisors (see below), whose sum is σ = 2195084288. Its totient is φ = 822603600.

The previous prime is 1440040127. The next prime is 1440040181. The reversal of 1440040161 is 1610400441.

It is not a de Polignac number, because 1440040161 - 2⁷ = 1440040033 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1440040181) 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, 63966 + ... + 83496.

It is an arithmetic number, because the mean of its divisors is an integer number (137192768).

Almost surely, 2^1440040161 is an apocalyptic number.

It is an amenable number.

1440040161 is a deficient number, since it is larger than the sum of its proper divisors (755044127).

1440040161 is a wasteful number, since it uses less digits than its factorization.

1440040161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23052.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1440040161 is about 37947.8610859690. The cubic root of 1440040161 is about 1129.2537326007.

The spelling of 1440040161 in words is "one billion, four hundred forty million, forty thousand, one hundred sixty-one".