343840440 has 32 divisors (see below), whose sum is σ = 1031521680. Its totient is φ = 91690752.

The previous prime is 343840429. The next prime is 343840447. The reversal of 343840440 is 44048343.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 343840398 and 343840407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343840447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1432549 + ... + 1432788.

Almost surely, 2^343840440 is an apocalyptic number.

343840440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

343840440 is an abundant number, since it is smaller than the sum of its proper divisors (687681240).

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

343840440 is a wasteful number, since it uses less digits than its factorization.

343840440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2865351 (or 2865347 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 343840440 is about 18542.9350427595. The cubic root of 343840440 is about 700.5712615647.

Adding to 343840440 its reverse (44048343), we get a palindrome (387888783).

The spelling of 343840440 in words is "three hundred forty-three million, eight hundred forty thousand, four hundred forty".