726271019 has 4 divisors (see below), whose sum is σ = 729388296. Its totient is φ = 723153744.

The previous prime is 726271003. The next prime is 726271079. The reversal of 726271019 is 910172627.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 726271019 - 2⁴ = 726271003 is a prime.

It is a super-2 number, since 2×726271019² = 1054939186078596722, 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 726271019.

It is not an unprimeable number, because it can be changed into a prime (726271079) 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, 1558289 + ... + 1558754.

It is an arithmetic number, because the mean of its divisors is an integer number (182347074).

Almost surely, 2^726271019 is an apocalyptic number.

726271019 is a deficient number, since it is larger than the sum of its proper divisors (3117277).

726271019 is a wasteful number, since it uses less digits than its factorization.

726271019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3117276.

The product of its (nonzero) digits is 10584, while the sum is 35.

The square root of 726271019 is about 26949.4159305911. The cubic root of 726271019 is about 898.8755582819.

The spelling of 726271019 in words is "seven hundred twenty-six million, two hundred seventy-one thousand, nineteen".