316640421 has 20 divisors (see below), whose sum is σ = 474982112. Its totient is φ = 211080492.

The previous prime is 316640411. The next prime is 316640431. The reversal of 316640421 is 124046613.

316640421 is a `hidden beast` number, since 3 + 16 + 640 + 4 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (316640411) and next prime (316640431).

It is not a de Polignac number, because 316640421 - 2¹⁰ = 316639397 is a prime.

It is a super-2 number, since 2×316640421² = 200522312422114482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (316640411) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11640 + ... + 27726.

Almost surely, 2^316640421 is an apocalyptic number.

It is an amenable number.

316640421 is a deficient number, since it is larger than the sum of its proper divisors (158341691).

316640421 is an frugal number, since it uses more digits than its factorization.

316640421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16114 (or 16090 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 316640421 is about 17794.3929652011. The cubic root of 316640421 is about 681.5882863180.

The spelling of 316640421 in words is "three hundred sixteen million, six hundred forty thousand, four hundred twenty-one".