140409 has 6 divisors (see below), whose sum is σ = 202826. Its totient is φ = 93600.

The previous prime is 140407. The next prime is 140411. The reversal of 140409 is 904041.

It is an interprime number because it is at equal distance from previous prime (140407) and next prime (140411).

It can be written as a sum of positive squares in only one way, i.e., 138384 + 2025 = 372^2 + 45^2 .

It is not a de Polignac number, because 140409 - 2¹ = 140407 is a prime.

It is a Duffinian number.

140409 is a lucky number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 140391 and 140400.

It is not an unprimeable number, because it can be changed into a prime (140401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7792 + ... + 7809.

2¹⁴⁰⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

140409 is a deficient number, since it is larger than the sum of its proper divisors (62417).

140409 is a wasteful number, since it uses less digits than its factorization.

140409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15607 (or 15604 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 140409 is about 374.7118893230. The cubic root of 140409 is about 51.9754568597.

The spelling of 140409 in words is "one hundred forty thousand, four hundred nine".