140444661 has 16 divisors (see below), whose sum is σ = 214605824. Its totient is φ = 80031024.

The previous prime is 140444621. The next prime is 140444677. The reversal of 140444661 is 166444041.

It is not a de Polignac number, because 140444661 - 2⁷ = 140444533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140444621) 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, 1405 + ... + 16818.

It is an arithmetic number, because the mean of its divisors is an integer number (13412864).

Almost surely, 2^140444661 is an apocalyptic number.

It is an amenable number.

140444661 is a deficient number, since it is larger than the sum of its proper divisors (74161163).

140444661 is a wasteful number, since it uses less digits than its factorization.

140444661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18600.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 140444661 is about 11850.9350264019. The cubic root of 140444661 is about 519.7985671979.

The spelling of 140444661 in words is "one hundred forty million, four hundred forty-four thousand, six hundred sixty-one".