1729722401 has 4 divisors (see below), whose sum is σ = 1886969904. Its totient is φ = 1572474900.

The previous prime is 1729722359. The next prime is 1729722427. The reversal of 1729722401 is 1042279271.

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 a de Polignac number, because none of the positive numbers 2^k-1729722401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1729722431) 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, 78623735 + ... + 78623756.

It is an arithmetic number, because the mean of its divisors is an integer number (471742476).

Almost surely, 2^1729722401 is an apocalyptic number.

1729722401 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1729722401 is a deficient number, since it is larger than the sum of its proper divisors (157247503).

1729722401 is a wasteful number, since it uses less digits than its factorization.

1729722401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157247502.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 1729722401 is about 41589.9314858777. The cubic root of 1729722401 is about 1200.3985715378.

The spelling of 1729722401 in words is "one billion, seven hundred twenty-nine million, seven hundred twenty-two thousand, four hundred one".