73979491 has 4 divisors (see below), whose sum is σ = 74081152. Its totient is φ = 73877832.

The previous prime is 73979473. The next prime is 73979501. The reversal of 73979491 is 19497937.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19497937 = 571 ⋅34147.

It is a cyclic number.

It is not a de Polignac number, because 73979491 - 2⁵ = 73979459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73979791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49731 + ... + 51196.

It is an arithmetic number, because the mean of its divisors is an integer number (18520288).

Almost surely, 2^73979491 is an apocalyptic number.

73979491 is a deficient number, since it is larger than the sum of its proper divisors (101661).

73979491 is a wasteful number, since it uses less digits than its factorization.

73979491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101660.

The product of its digits is 428652, while the sum is 49.

The square root of 73979491 is about 8601.1331230251. The cubic root of 73979491 is about 419.7948563547.

The spelling of 73979491 in words is "seventy-three million, nine hundred seventy-nine thousand, four hundred ninety-one".