140138631 has 24 divisors (see below), whose sum is σ = 213417984. Its totient is φ = 88480080.

The previous prime is 140138627. The next prime is 140138639. The reversal of 140138631 is 136831041.

140138631 is a `hidden beast` number, since 14 + 0 + 13 + 8 + 631 = 666.

It is not a de Polignac number, because 140138631 - 2² = 140138627 is a prime.

It is a super-2 number, since 2×140138631² = 39277671797108322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 140138595 and 140138604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140138639) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7770 + ... + 18456.

It is an arithmetic number, because the mean of its divisors is an integer number (8892416).

Almost surely, 2^140138631 is an apocalyptic number.

140138631 is a deficient number, since it is larger than the sum of its proper divisors (73279353).

140138631 is a wasteful number, since it uses less digits than its factorization.

140138631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10771 (or 10768 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 140138631 is about 11838.0163456552. The cubic root of 140138631 is about 519.4207442756.

Adding to 140138631 its reverse (136831041), we get a palindrome (276969672).

The spelling of 140138631 in words is "one hundred forty million, one hundred thirty-eight thousand, six hundred thirty-one".