140143409 has 4 divisors (see below), whose sum is σ = 160163904. Its totient is φ = 120122916.

The previous prime is 140143403. The next prime is 140143463. The reversal of 140143409 is 904341041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 904341041 = 43 ⋅21031187.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140143409 is a prime.

It is a super-2 number, since 2×140143409² = 39280350172282562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140143403) 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 in 3 ways as a sum of consecutive naturals, for example, 10010237 + ... + 10010250.

It is an arithmetic number, because the mean of its divisors is an integer number (40040976).

Almost surely, 2^140143409 is an apocalyptic number.

It is an amenable number.

140143409 is a deficient number, since it is larger than the sum of its proper divisors (20020495).

140143409 is an equidigital number, since it uses as much as digits as its factorization.

140143409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20020494.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 140143409 is about 11838.2181513942. The cubic root of 140143409 is about 519.4266473923.

The spelling of 140143409 in words is "one hundred forty million, one hundred forty-three thousand, four hundred nine".