686465421 has 16 divisors (see below), whose sum is σ = 964079040. Its totient is φ = 433278720.

The previous prime is 686465401. The next prime is 686465431. The reversal of 686465421 is 124564686.

It is not a de Polignac number, because 686465421 - 2¹¹ = 686463373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686465401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120391 + ... + 125963.

It is an arithmetic number, because the mean of its divisors is an integer number (60254940).

Almost surely, 2^686465421 is an apocalyptic number.

It is an amenable number.

686465421 is a deficient number, since it is larger than the sum of its proper divisors (277613619).

686465421 is a wasteful number, since it uses less digits than its factorization.

686465421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7756.

The product of its digits is 276480, while the sum is 42.

The square root of 686465421 is about 26200.4851290964. The cubic root of 686465421 is about 882.1441434811.

The spelling of 686465421 in words is "six hundred eighty-six million, four hundred sixty-five thousand, four hundred twenty-one".