349731 has 8 divisors (see below), whose sum is σ = 518160. Its totient is φ = 233136.

The previous prime is 349729. The next prime is 349753. The reversal of 349731 is 137943.

It is not a de Polignac number, because 349731 - 2¹ = 349729 is a prime.

It is a super-2 number, since 2×349731² = 244623544722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 12953 = 349731 / (3 + 4 + 9 + 7 + 3 + 1).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 349695 and 349704.

It is not an unprimeable number, because it can be changed into a prime (349331) 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, 6450 + ... + 6503.

It is an arithmetic number, because the mean of its divisors is an integer number (64770).

2³⁴⁹⁷³¹ is an apocalyptic number.

349731 is a deficient number, since it is larger than the sum of its proper divisors (168429).

349731 is a wasteful number, since it uses less digits than its factorization.

349731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12962 (or 12956 counting only the distinct ones).

The product of its digits is 2268, while the sum is 27.

The square root of 349731 is about 591.3805881156. The cubic root of 349731 is about 70.4549281851.

The spelling of 349731 in words is "three hundred forty-nine thousand, seven hundred thirty-one".