140409661 has 8 divisors (see below), whose sum is σ = 161066880. Its totient is φ = 119902128.

The previous prime is 140409629. The next prime is 140409673. The reversal of 140409661 is 166904041.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 140409661 - 2⁵ = 140409629 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 (140409611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35401 + ... + 39166.

It is an arithmetic number, because the mean of its divisors is an integer number (20133360).

Almost surely, 2^140409661 is an apocalyptic number.

It is an amenable number.

140409661 is a deficient number, since it is larger than the sum of its proper divisors (20657219).

140409661 is an equidigital number, since it uses as much as digits as its factorization.

140409661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74843.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 140409661 is about 11849.4582576589. The cubic root of 140409661 is about 519.7553842075.

The spelling of 140409661 in words is "one hundred forty million, four hundred nine thousand, six hundred sixty-one".