1440691 has 16 divisors (see below), whose sum is σ = 1751040. Its totient is φ = 1159200.

The previous prime is 1440689. The next prime is 1440707. The reversal of 1440691 is 1960441.

It is not a de Polignac number, because 1440691 - 2¹ = 1440689 is a prime.

It is a Duffinian number.

1440691 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1440611) 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, 9466 + ... + 9616.

It is an arithmetic number, because the mean of its divisors is an integer number (109440).

2^1440691 is an apocalyptic number.

1440691 is a deficient number, since it is larger than the sum of its proper divisors (310349).

1440691 is a wasteful number, since it uses less digits than its factorization.

1440691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1440691 is about 1200.2878821349. The cubic root of 1440691 is about 112.9423832411.

The spelling of 1440691 in words is "one million, four hundred forty thousand, six hundred ninety-one".