79721949 has 8 divisors (see below), whose sum is σ = 106672672. Its totient is φ = 52959600.

The previous prime is 79721947. The next prime is 79721951. The reversal of 79721949 is 94912797.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (79721947) and next prime (79721951).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 79721949 - 2¹ = 79721947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79721898 and 79721907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79721947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46102 + ... + 47799.

It is an arithmetic number, because the mean of its divisors is an integer number (13334084).

Almost surely, 2^79721949 is an apocalyptic number.

It is an amenable number.

79721949 is a deficient number, since it is larger than the sum of its proper divisors (26950723).

79721949 is a wasteful number, since it uses less digits than its factorization.

79721949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94187.

The product of its digits is 285768, while the sum is 48.

The square root of 79721949 is about 8928.7148571337. The cubic root of 79721949 is about 430.3871562717.

The spelling of 79721949 in words is "seventy-nine million, seven hundred twenty-one thousand, nine hundred forty-nine".