140840642 has 4 divisors (see below), whose sum is σ = 211260966. Its totient is φ = 70420320.

The previous prime is 140840629. The next prime is 140840653. The reversal of 140840642 is 246048041.

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., 139736041 + 1104601 = 11821^2 + 1051^2 .

It is an unprimeable number.

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, 35210159 + ... + 35210162.

Almost surely, 2^140840642 is an apocalyptic number.

140840642 is a deficient number, since it is larger than the sum of its proper divisors (70420324).

140840642 is an equidigital number, since it uses as much as digits as its factorization.

140840642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70420323.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 140840642 is about 11867.6300077143. The cubic root of 140840642 is about 520.2866294532.

Adding to 140840642 its reverse (246048041), we get a palindrome (386888683).

The spelling of 140840642 in words is "one hundred forty million, eight hundred forty thousand, six hundred forty-two".