1722729457 has 4 divisors (see below), whose sum is σ = 1725061360. Its totient is φ = 1720397556.

The previous prime is 1722729439. The next prime is 1722729461. The reversal of 1722729457 is 7549272271.

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: 7549272271 = 653 ⋅11560907.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1722729457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1722729467) 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, 1164843 + ... + 1166320.

It is an arithmetic number, because the mean of its divisors is an integer number (431265340).

Almost surely, 2^1722729457 is an apocalyptic number.

It is an amenable number.

1722729457 is a deficient number, since it is larger than the sum of its proper divisors (2331903).

1722729457 is an equidigital number, since it uses as much as digits as its factorization.

1722729457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331902.

The product of its digits is 493920, while the sum is 46.

The square root of 1722729457 is about 41505.7761883813. The cubic root of 1722729457 is about 1198.7787243914.

The spelling of 1722729457 in words is "one billion, seven hundred twenty-two million, seven hundred twenty-nine thousand, four hundred fifty-seven".