340440431 has 4 divisors (see below), whose sum is σ = 340494000. Its totient is φ = 340386864.

The previous prime is 340440427. The next prime is 340440439. The reversal of 340440431 is 134044043.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134044043 = 7 ⋅19149149.

It is a cyclic number.

It is not a de Polignac number, because 340440431 - 2² = 340440427 is a prime.

It is a super-2 number, since 2×340440431² = 231799374118931522, 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 = 340440397 and 340440406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340440439) 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, 15731 + ... + 30468.

It is an arithmetic number, because the mean of its divisors is an integer number (85123500).

Almost surely, 2^340440431 is an apocalyptic number.

340440431 is a deficient number, since it is larger than the sum of its proper divisors (53569).

340440431 is an equidigital number, since it uses as much as digits as its factorization.

340440431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53568.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 340440431 is about 18451.0279117452. The cubic root of 340440431 is about 698.2544474256.

Adding to 340440431 its reverse (134044043), we get a palindrome (474484474).

The spelling of 340440431 in words is "three hundred forty million, four hundred forty thousand, four hundred thirty-one".