349843689 has 30 divisors (see below), whose sum is σ = 547841346. Its totient is φ = 215130240.

The previous prime is 349843687. The next prime is 349843691. The reversal of 349843689 is 986348943.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (349843687) and next prime (349843691).

It can be written as a sum of positive squares in 5 ways, for example, as 333683289 + 16160400 = 18267^2 + 4020^2 .

It is not a de Polignac number, because 349843689 - 2¹ = 349843687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (349843687) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 256369 + ... + 257729.

Almost surely, 2^349843689 is an apocalyptic number.

349843689 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

It is an amenable number.

349843689 is a deficient number, since it is larger than the sum of its proper divisors (197997657).

349843689 is an equidigital number, since it uses as much as digits as its factorization.

349843689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1419 (or 1377 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The square root of 349843689 is about 18704.1088801365. The cubic root of 349843689 is about 704.6249461264.

The spelling of 349843689 in words is "three hundred forty-nine million, eight hundred forty-three thousand, six hundred eighty-nine".