140345405 has 4 divisors (see below), whose sum is σ = 168414492. Its totient is φ = 112276320.

The previous prime is 140345399. The next prime is 140345411. The reversal of 140345405 is 504543041.

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

It is an interprime number because it is at equal distance from previous prime (140345399) and next prime (140345411).

It can be written as a sum of positive squares in 2 ways, for example, as 52041796 + 88303609 = 7214^2 + 9397^2 .

It is not a de Polignac number, because 140345405 - 2⁴ = 140345389 is a prime.

It is a super-2 number, since 2×140345405² = 39393665409228050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14034536 + ... + 14034545.

It is an arithmetic number, because the mean of its divisors is an integer number (42103623).

Almost surely, 2^140345405 is an apocalyptic number.

It is an amenable number.

140345405 is a deficient number, since it is larger than the sum of its proper divisors (28069087).

140345405 is an equidigital number, since it uses as much as digits as its factorization.

140345405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28069086.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 140345405 is about 11846.7465998054. The cubic root of 140345405 is about 519.6760864877.

Adding to 140345405 its reverse (504543041), we get a palindrome (644888446).

The spelling of 140345405 in words is "one hundred forty million, three hundred forty-five thousand, four hundred five".