65397921 has 8 divisors (see below), whose sum is σ = 87388224. Its totient is φ = 43503120.

The previous prime is 65397889. The next prime is 65397923. The reversal of 65397921 is 12979356.

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

It is not a de Polignac number, because 65397921 - 2⁵ = 65397889 is a prime.

It is a super-2 number, since 2×65397921² = 8553776142244482, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (65397923) 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, 22261 + ... + 25026.

It is an arithmetic number, because the mean of its divisors is an integer number (10923528).

Almost surely, 2^65397921 is an apocalyptic number.

It is an amenable number.

65397921 is a deficient number, since it is larger than the sum of its proper divisors (21990303).

65397921 is a wasteful number, since it uses less digits than its factorization.

65397921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47751.

The product of its digits is 102060, while the sum is 42.

The square root of 65397921 is about 8086.8981074328. The cubic root of 65397921 is about 402.8913847927.

The spelling of 65397921 in words is "sixty-five million, three hundred ninety-seven thousand, nine hundred twenty-one".