16457729 has 4 divisors (see below), whose sum is σ = 16689600. Its totient is φ = 16225860.

The previous prime is 16457723. The next prime is 16457731. The reversal of 16457729 is 92775461.

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, and also an emirpimes, since its reverse is a distinct semiprime: 92775461 = 19 ⋅4882919.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16457729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16457723) 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, 115829 + ... + 115970.

It is an arithmetic number, because the mean of its divisors is an integer number (4172400).

It is a Proth number, since it is equal to 2009 ⋅ 2¹³ + 1 and 2009 < 2¹³.

Almost surely, 2^16457729 is an apocalyptic number.

It is an amenable number.

16457729 is a deficient number, since it is larger than the sum of its proper divisors (231871).

16457729 is an equidigital number, since it uses as much as digits as its factorization.

16457729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231870.

The product of its digits is 105840, while the sum is 41.

The square root of 16457729 is about 4056.8126651350. The cubic root of 16457729 is about 254.3645796793.

The spelling of 16457729 in words is "sixteen million, four hundred fifty-seven thousand, seven hundred twenty-nine".