343721731 has 4 divisors (see below), whose sum is σ = 347265352. Its totient is φ = 340178112.

The previous prime is 343721699. The next prime is 343721767. The reversal of 343721731 is 137127343.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 137127343 = 751 ⋅182593.

It is a cyclic number.

It is not a de Polignac number, because 343721731 - 2⁵ = 343721699 is a prime.

It is a super-2 number, since 2×343721731² = 236289256723272722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 343721693 and 343721702.

It is not an unprimeable number, because it can be changed into a prime (343721531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1771665 + ... + 1771858.

It is an arithmetic number, because the mean of its divisors is an integer number (86816338).

Almost surely, 2^343721731 is an apocalyptic number.

343721731 is a deficient number, since it is larger than the sum of its proper divisors (3543621).

343721731 is an equidigital number, since it uses as much as digits as its factorization.

343721731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3543620.

The product of its digits is 10584, while the sum is 31.

The square root of 343721731 is about 18539.7338438285. The cubic root of 343721731 is about 700.4906295072.

The spelling of 343721731 in words is "three hundred forty-three million, seven hundred twenty-one thousand, seven hundred thirty-one".