140190861 has 4 divisors (see below), whose sum is σ = 186921152. Its totient is φ = 93460572.

The previous prime is 140190859. The next prime is 140190877. The reversal of 140190861 is 168091041.

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.

It is not a de Polignac number, because 140190861 - 2¹ = 140190859 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140190881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23365141 + ... + 23365146.

It is an arithmetic number, because the mean of its divisors is an integer number (46730288).

Almost surely, 2^140190861 is an apocalyptic number.

It is an amenable number.

140190861 is a deficient number, since it is larger than the sum of its proper divisors (46730291).

140190861 is an equidigital number, since it uses as much as digits as its factorization.

140190861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46730290.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 140190861 is about 11840.2221685237. Note that the first 3 decimals coincide. The cubic root of 140190861 is about 519.4852660414.

The spelling of 140190861 in words is "one hundred forty million, one hundred ninety thousand, eight hundred sixty-one".