340540405 has 8 divisors (see below), whose sum is σ = 409545432. Its totient is φ = 271834368.

The previous prime is 340540399. The next prime is 340540463. The reversal of 340540405 is 504045043.

It can be written as a sum of positive squares in 4 ways, for example, as 47651409 + 292888996 = 6903^2 + 17114^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 340540405 - 2³ = 340540397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 340540405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72232 + ... + 76801.

It is an arithmetic number, because the mean of its divisors is an integer number (51193179).

Almost surely, 2^340540405 is an apocalyptic number.

It is an amenable number.

340540405 is a deficient number, since it is larger than the sum of its proper divisors (69005027).

340540405 is a wasteful number, since it uses less digits than its factorization.

340540405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149495.

The product of its (nonzero) digits is 4800, while the sum is 25.

The square root of 340540405 is about 18453.7368844362. The cubic root of 340540405 is about 698.3227907163.

Adding to 340540405 its reverse (504045043), we get a palindrome (844585448).

The spelling of 340540405 in words is "three hundred forty million, five hundred forty thousand, four hundred five".