340423523405 has 12 divisors (see below), whose sum is σ = 475203449340. Its totient is φ = 233433273024.

The previous prime is 340423523387. The next prime is 340423523449. The reversal of 340423523405 is 504325324043.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 230787042409 + 109636480996 = 480403^2 + 331114^2 .

It is a de Polignac number, because none of the positive numbers 2^k-340423523405 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 694741640 + ... + 694742129.

It is an arithmetic number, because the mean of its divisors is an integer number (39600287445).

Almost surely, 2^340423523405 is an apocalyptic number.

340423523405 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

340423523405 is a deficient number, since it is larger than the sum of its proper divisors (134779925935).

340423523405 is a wasteful number, since it uses less digits than its factorization.

340423523405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1389483788 (or 1389483781 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 35.

Adding to 340423523405 its reverse (504325324043), we get a palindrome (844748847448).

The spelling of 340423523405 in words is "three hundred forty billion, four hundred twenty-three million, five hundred twenty-three thousand, four hundred five".