140643506 has 4 divisors (see below), whose sum is σ = 210965262. Its totient is φ = 70321752.

The previous prime is 140643487. The next prime is 140643521. The reversal of 140643506 is 605346041.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 124523281 + 16120225 = 11159^2 + 4015^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35160875 + ... + 35160878.

Almost surely, 2^140643506 is an apocalyptic number.

140643506 is a deficient number, since it is larger than the sum of its proper divisors (70321756).

140643506 is an equidigital number, since it uses as much as digits as its factorization.

140643506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70321755.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 140643506 is about 11859.3214814339. The cubic root of 140643506 is about 520.0437660402.

Adding to 140643506 its reverse (605346041), we get a palindrome (745989547).

The spelling of 140643506 in words is "one hundred forty million, six hundred forty-three thousand, five hundred six".