721914847 has 4 divisors (see below), whose sum is σ = 722301336. Its totient is φ = 721528360.

The previous prime is 721914833. The next prime is 721914913. The reversal of 721914847 is 748419127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 748419127 = 13679 ⋅54713.

It is a cyclic number.

It is not a de Polignac number, because 721914847 - 2¹⁹ = 721390559 is a prime.

It is a super-2 number, since 2×721914847² = 1042322092638066818, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721914247) 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, 190429 + ... + 194182.

It is an arithmetic number, because the mean of its divisors is an integer number (180575334).

Almost surely, 2^721914847 is an apocalyptic number.

721914847 is a deficient number, since it is larger than the sum of its proper divisors (386489).

721914847 is a wasteful number, since it uses less digits than its factorization.

721914847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386488.

The product of its digits is 112896, while the sum is 43.

The square root of 721914847 is about 26868.4731051096. The cubic root of 721914847 is about 897.0748019401.

The spelling of 721914847 in words is "seven hundred twenty-one million, nine hundred fourteen thousand, eight hundred forty-seven".