140020661 has 8 divisors (see below), whose sum is σ = 156000384. Its totient is φ = 124582720.

The previous prime is 140020631. The next prime is 140020663. The reversal of 140020661 is 166020041.

It is a happy number.

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 140020661 - 2¹⁰ = 140019637 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 (140020663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134900 + ... + 135933.

It is an arithmetic number, because the mean of its divisors is an integer number (19500048).

Almost surely, 2^140020661 is an apocalyptic number.

140020661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

140020661 is a deficient number, since it is larger than the sum of its proper divisors (15979723).

140020661 is a wasteful number, since it uses less digits than its factorization.

140020661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270891.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 140020661 is about 11833.0326205922. The cubic root of 140020661 is about 519.2749522907.

The spelling of 140020661 in words is "one hundred forty million, twenty thousand, six hundred sixty-one".