140026639 has 4 divisors (see below), whose sum is σ = 140140000. Its totient is φ = 139913280.

The previous prime is 140026613. The next prime is 140026651. The reversal of 140026639 is 936620041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 936620041 = 7 ⋅133802863.

It is a cyclic number.

It is not a de Polignac number, because 140026639 - 2⁷ = 140026511 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 140026639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140026609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54807 + ... + 57304.

It is an arithmetic number, because the mean of its divisors is an integer number (35035000).

Almost surely, 2^140026639 is an apocalyptic number.

140026639 is a deficient number, since it is larger than the sum of its proper divisors (113361).

140026639 is a wasteful number, since it uses less digits than its factorization.

140026639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113360.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 140026639 is about 11833.2852158646. The cubic root of 140026639 is about 519.2823421084.

The spelling of 140026639 in words is "one hundred forty million, twenty-six thousand, six hundred thirty-nine".