65396421 has 24 divisors (see below), whose sum is σ = 100008480. Its totient is φ = 41108256.

The previous prime is 65396417. The next prime is 65396431. The reversal of 65396421 is 12469356.

It is a happy number.

65396421 is a `hidden beast` number, since 6 + 5 + 3 + 9 + 642 + 1 = 666.

It is not a de Polignac number, because 65396421 - 2² = 65396417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65396431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8310 + ... + 14136.

It is an arithmetic number, because the mean of its divisors is an integer number (4167020).

Almost surely, 2^65396421 is an apocalyptic number.

It is an amenable number.

65396421 is a deficient number, since it is larger than the sum of its proper divisors (34612059).

65396421 is a wasteful number, since it uses less digits than its factorization.

65396421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5905 (or 5902 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 65396421 is about 8086.8053642956. The cubic root of 65396421 is about 402.8883044619. Note that the first 3 decimals are identical.

The spelling of 65396421 in words is "sixty-five million, three hundred ninety-six thousand, four hundred twenty-one".