140642647 has 2 divisors, whose sum is σ = 140642648. Its totient is φ = 140642646.

The previous prime is 140642639. The next prime is 140642687. The reversal of 140642647 is 746246041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 140642647 - 2³ = 140642639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140642687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70321323 + 70321324.

It is an arithmetic number, because the mean of its divisors is an integer number (70321324).

Almost surely, 2^140642647 is an apocalyptic number.

140642647 is a deficient number, since it is larger than the sum of its proper divisors (1).

140642647 is an equidigital number, since it uses as much as digits as its factorization.

140642647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 140642647 is about 11859.2852651414. The cubic root of 140642647 is about 520.0427072912.

Adding to 140642647 its reverse (746246041), we get a palindrome (886888688).

The spelling of 140642647 in words is "one hundred forty million, six hundred forty-two thousand, six hundred forty-seven".