140204431 has 4 divisors (see below), whose sum is σ = 143187552. Its totient is φ = 137221312.

The previous prime is 140204429. The next prime is 140204447. The reversal of 140204431 is 134402041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134402041 = 23 ⋅5843567.

It is a cyclic number.

It is not a de Polignac number, because 140204431 - 2¹ = 140204429 is a prime.

It is a super-2 number, since 2×140204431² = 39314564944067522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140204399 and 140204408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140204231) 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, 1491490 + ... + 1491583.

It is an arithmetic number, because the mean of its divisors is an integer number (35796888).

Almost surely, 2^140204431 is an apocalyptic number.

140204431 is a deficient number, since it is larger than the sum of its proper divisors (2983121).

140204431 is an equidigital number, since it uses as much as digits as its factorization.

140204431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2983120.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 140204431 is about 11840.7952013368. The cubic root of 140204431 is about 519.5020269713.

Adding to 140204431 its reverse (134402041), we get a palindrome (274606472).

The spelling of 140204431 in words is "one hundred forty million, two hundred four thousand, four hundred thirty-one".