140384161 has 4 divisors (see below), whose sum is σ = 140411524. Its totient is φ = 140356800.

The previous prime is 140384117. The next prime is 140384171. The reversal of 140384161 is 161483041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161483041 = 1187 ⋅136043.

It can be written as a sum of positive squares in 2 ways, for example, as 98704225 + 41679936 = 9935^2 + 6456^2 .

It is a 3-Lehmer number, since φ(140384161) divides (140384161-1)³.

It is a cyclic number.

It is not a de Polignac number, because 140384161 - 2⁷ = 140384033 is a prime.

It is a deceptive number, since it divides R_140384160.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140384171) 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, 3420 + ... + 17101.

It is an arithmetic number, because the mean of its divisors is an integer number (35102881).

Almost surely, 2^140384161 is an apocalyptic number.

140384161 is the 6841-st octagonal number.

It is an amenable number.

140384161 is a deficient number, since it is larger than the sum of its proper divisors (27363).

140384161 is an equidigital number, since it uses as much as digits as its factorization.

140384161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27362.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 140384161 is about 11848.3822102429. The cubic root of 140384161 is about 519.7239177955.

The spelling of 140384161 in words is "one hundred forty million, three hundred eighty-four thousand, one hundred sixty-one".