67397971 has 4 divisors (see below), whose sum is σ = 67646944. Its totient is φ = 67149000.

The previous prime is 67397969. The next prime is 67397983. The reversal of 67397971 is 17979376.

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 67397971 - 2¹ = 67397969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67397951) 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, 124080 + ... + 124621.

It is an arithmetic number, because the mean of its divisors is an integer number (16911736).

Almost surely, 2^67397971 is an apocalyptic number.

67397971 is a deficient number, since it is larger than the sum of its proper divisors (248973).

67397971 is a wasteful number, since it uses less digits than its factorization.

67397971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248972.

The product of its digits is 500094, while the sum is 49.

The square root of 67397971 is about 8209.6267272026. The cubic root of 67397971 is about 406.9573913986.

The spelling of 67397971 in words is "sixty-seven million, three hundred ninety-seven thousand, nine hundred seventy-one".