3145729 has 4 divisors (see below), whose sum is σ = 3150784. Its totient is φ = 3140676.

The previous prime is 3145721. The next prime is 3145739. The reversal of 3145729 is 9275413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3145729 - 2³ = 3145721 is a prime.

It is a super-2 number, since 2×3145729² = 19791221882882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3145729.

It is not an unprimeable number, because it can be changed into a prime (3145721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1437 + ... + 2890.

It is an arithmetic number, because the mean of its divisors is an integer number (787696).

It is a Proth number, since it is equal to 3 ⋅ 2²⁰ + 1 and 3 < 2²⁰.

Almost surely, 2^3145729 is an apocalyptic number.

It is an amenable number.

3145729 is a deficient number, since it is larger than the sum of its proper divisors (5055).

3145729 is an equidigital number, since it uses as much as digits as its factorization.

3145729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5054.

The product of its digits is 7560, while the sum is 31.

The square root of 3145729 is about 1773.6203088598. The cubic root of 3145729 is about 146.5234385730.

The spelling of 3145729 in words is "three million, one hundred forty-five thousand, seven hundred twenty-nine".