140349218 has 4 divisors (see below), whose sum is σ = 210523830. Its totient is φ = 70174608.

The previous prime is 140349217. The next prime is 140349221. The reversal of 140349218 is 812943041.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 812943041 = 101 ⋅8048941.

It can be written as a sum of positive squares in only one way, i.e., 85248289 + 55100929 = 9233^2 + 7423^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (140349217) 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, 35087303 + ... + 35087306.

Almost surely, 2^140349218 is an apocalyptic number.

140349218 is a deficient number, since it is larger than the sum of its proper divisors (70174612).

140349218 is an equidigital number, since it uses as much as digits as its factorization.

140349218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70174611.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 140349218 is about 11846.9075289714. The cubic root of 140349218 is about 519.6807927503.

The spelling of 140349218 in words is "one hundred forty million, three hundred forty-nine thousand, two hundred eighteen".