140038642 has 4 divisors (see below), whose sum is σ = 210057966. Its totient is φ = 70019320.

The previous prime is 140038637. The next prime is 140038649. The reversal of 140038642 is 246830041.

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., 101586241 + 38452401 = 10079^2 + 6201^2 .

It is a super-2 number, since 2×140038642² = 39221642506408328, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 140038642.

It is not an unprimeable number, because it can be changed into a prime (140038649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35009659 + ... + 35009662.

Almost surely, 2^140038642 is an apocalyptic number.

140038642 is a deficient number, since it is larger than the sum of its proper divisors (70019324).

140038642 is an equidigital number, since it uses as much as digits as its factorization.

140038642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70019323.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 140038642 is about 11833.7923760729. The cubic root of 140038642 is about 519.2971792088.

Adding to 140038642 its reverse (246830041), we get a palindrome (386868683).

The spelling of 140038642 in words is "one hundred forty million, thirty-eight thousand, six hundred forty-two".