343442991 has 12 divisors (see below), whose sum is σ = 470567832. Its totient is φ = 222647184.

The previous prime is 343442989. The next prime is 343442999. The reversal of 343442991 is 199244343.

It is not a de Polignac number, because 343442991 - 2¹ = 343442989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (343442999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 194370 + ... + 196128.

It is an arithmetic number, because the mean of its divisors is an integer number (39213986).

Almost surely, 2^343442991 is an apocalyptic number.

343442991 is a deficient number, since it is larger than the sum of its proper divisors (127124841).

343442991 is an frugal number, since it uses more digits than its factorization.

343442991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3558 (or 1799 counting only the distinct ones).

The product of its digits is 93312, while the sum is 39.

The square root of 343442991 is about 18532.2149512680. The cubic root of 343442991 is about 700.3012247798.

The spelling of 343442991 in words is "three hundred forty-three million, four hundred forty-two thousand, nine hundred ninety-one".