140664639 has 16 divisors (see below), whose sum is σ = 198840320. Its totient is φ = 88296480.

The previous prime is 140664631. The next prime is 140664659. The reversal of 140664639 is 936466041.

It is not a de Polignac number, because 140664639 - 2³ = 140664631 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140664597 and 140664606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140664631) 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, 16999 + ... + 23880.

It is an arithmetic number, because the mean of its divisors is an integer number (12427520).

Almost surely, 2^140664639 is an apocalyptic number.

140664639 is a deficient number, since it is larger than the sum of its proper divisors (58175681).

140664639 is a wasteful number, since it uses less digits than its factorization.

140664639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40950.

The product of its (nonzero) digits is 93312, while the sum is 39.

The square root of 140664639 is about 11860.2124348597. The cubic root of 140664639 is about 520.0698118795.

The spelling of 140664639 in words is "one hundred forty million, six hundred sixty-four thousand, six hundred thirty-nine".