65387421 has 24 divisors (see below), whose sum is σ = 103334400. Its totient is φ = 39513600.

The previous prime is 65387419. The next prime is 65387429. The reversal of 65387421 is 12478356.

It is not a de Polignac number, because 65387421 - 2¹ = 65387419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65387429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43716 + ... + 45186.

It is an arithmetic number, because the mean of its divisors is an integer number (4305600).

Almost surely, 2^65387421 is an apocalyptic number.

It is an amenable number.

65387421 is a deficient number, since it is larger than the sum of its proper divisors (37946979).

65387421 is a wasteful number, since it uses less digits than its factorization.

65387421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937 (or 1934 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 65387421 is about 8086.2488831349. The cubic root of 65387421 is about 402.8698214876.

The spelling of 65387421 in words is "sixty-five million, three hundred eighty-seven thousand, four hundred twenty-one".