83494721 has 8 divisors (see below), whose sum is σ = 87986400. Its totient is φ = 79012800.

The previous prime is 83494717. The next prime is 83494739. The reversal of 83494721 is 12749438.

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

It is a cyclic number.

It is not a de Polignac number, because 83494721 - 2² = 83494717 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83494771) 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, 20990 + ... + 24648.

It is an arithmetic number, because the mean of its divisors is an integer number (10998300).

Almost surely, 2^83494721 is an apocalyptic number.

It is an amenable number.

83494721 is a deficient number, since it is larger than the sum of its proper divisors (4491679).

83494721 is a wasteful number, since it uses less digits than its factorization.

83494721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4879.

The product of its digits is 48384, while the sum is 38.

The square root of 83494721 is about 9137.5445826546. The cubic root of 83494721 is about 437.0720207634.

The spelling of 83494721 in words is "eighty-three million, four hundred ninety-four thousand, seven hundred twenty-one".