140664821 has 8 divisors (see below), whose sum is σ = 154973088. Its totient is φ = 126610000.

The previous prime is 140664781. The next prime is 140664829. The reversal of 140664821 is 128466041.

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

It is a de Polignac number, because none of the positive numbers 2^k-140664821 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 (140664829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62195 + ... + 64416.

It is an arithmetic number, because the mean of its divisors is an integer number (19371636).

Almost surely, 2^140664821 is an apocalyptic number.

140664821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

140664821 is a deficient number, since it is larger than the sum of its proper divisors (14308267).

140664821 is a wasteful number, since it uses less digits than its factorization.

140664821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126723.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 140664821 is about 11860.2201075697. The cubic root of 140664821 is about 520.0700361782.

The spelling of 140664821 in words is "one hundred forty million, six hundred sixty-four thousand, eight hundred twenty-one".