3457729 has 4 divisors (see below), whose sum is σ = 3772080. Its totient is φ = 3143380.

The previous prime is 3457723. The next prime is 3457763. The reversal of 3457729 is 9277543.

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 3457729 - 2³ = 3457721 is a prime.

It is a d-powerful number, because it can be written as 3 + 4³ + 5⁵ + 7⁴ + 7⁷ + 2²¹ + 9⁶ .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3457721) 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, 157159 + ... + 157180.

It is an arithmetic number, because the mean of its divisors is an integer number (943020).

Almost surely, 2^3457729 is an apocalyptic number.

It is an amenable number.

3457729 is a deficient number, since it is larger than the sum of its proper divisors (314351).

3457729 is a wasteful number, since it uses less digits than its factorization.

3457729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314350.

The product of its digits is 52920, while the sum is 37.

The square root of 3457729 is about 1859.4969749908. The cubic root of 3457729 is about 151.2157347874.

It can be divided in two parts, 3457 and 729, that added together give a triangular number (4186 = T₉₁).

The spelling of 3457729 in words is "three million, four hundred fifty-seven thousand, seven hundred twenty-nine".