343521640 has 64 divisors (see below), whose sum is σ = 963653760. Its totient is φ = 107070720.

The previous prime is 343521623. The next prime is 343521649. The reversal of 343521640 is 46125343.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 343521599 and 343521608.

It is not an unprimeable number, because it can be changed into a prime (343521649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52687 + ... + 58846.

It is an arithmetic number, because the mean of its divisors is an integer number (15057090).

Almost surely, 2^343521640 is an apocalyptic number.

It is an amenable number.

343521640 is an abundant number, since it is smaller than the sum of its proper divisors (620132120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

343521640 is a wasteful number, since it uses less digits than its factorization.

343521640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111562 (or 111558 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 343521640 is about 18534.3367833867. The cubic root of 343521640 is about 700.3546774038.

Adding to 343521640 its reverse (46125343), we get a palindrome (389646983).

The spelling of 343521640 in words is "three hundred forty-three million, five hundred twenty-one thousand, six hundred forty".