140785405 has 4 divisors (see below), whose sum is σ = 168942492. Its totient is φ = 112628320.

The previous prime is 140785367. The next prime is 140785409. The reversal of 140785405 is 504587041.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 106936281 + 33849124 = 10341^2 + 5818^2 .

It is not a de Polignac number, because 140785405 - 2¹⁵ = 140752637 is a prime.

It is a super-2 number, since 2×140785405² = 39641060522028050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140785409) 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, 14078536 + ... + 14078545.

It is an arithmetic number, because the mean of its divisors is an integer number (42235623).

Almost surely, 2^140785405 is an apocalyptic number.

It is an amenable number.

140785405 is a deficient number, since it is larger than the sum of its proper divisors (28157087).

140785405 is an equidigital number, since it uses as much as digits as its factorization.

140785405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28157086.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 140785405 is about 11865.3025667279. The cubic root of 140785405 is about 520.2186026155.

The spelling of 140785405 in words is "one hundred forty million, seven hundred eighty-five thousand, four hundred five".