140640643 has 16 divisors (see below), whose sum is σ = 174950496. Its totient is φ = 111075840.

The previous prime is 140640637. The next prime is 140640649. The reversal of 140640643 is 346046041.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (140640637) and next prime (140640649).

It is a cyclic number.

It is not a de Polignac number, because 140640643 - 2⁹ = 140640131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140640649) 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, 26496 + ... + 31357.

It is an arithmetic number, because the mean of its divisors is an integer number (10934406).

Almost surely, 2^140640643 is an apocalyptic number.

140640643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

140640643 is a deficient number, since it is larger than the sum of its proper divisors (34309853).

140640643 is a wasteful number, since it uses less digits than its factorization.

140640643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57894.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 140640643 is about 11859.2007740825. The cubic root of 140640643 is about 520.0402372710.

Adding to 140640643 its reverse (346046041), we get a palindrome (486686684).

The spelling of 140640643 in words is "one hundred forty million, six hundred forty thousand, six hundred forty-three".