17672421 has 24 divisors (see below), whose sum is σ = 26158944. Its totient is φ = 10549440.

The previous prime is 17672419. The next prime is 17672429. The reversal of 17672421 is 12427671.

It is not a de Polignac number, because 17672421 - 2¹ = 17672419 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17672429) 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, 53226 + ... + 53556.

It is an arithmetic number, because the mean of its divisors is an integer number (1089956).

Almost surely, 2^17672421 is an apocalyptic number.

It is an amenable number.

17672421 is a deficient number, since it is larger than the sum of its proper divisors (8486523).

17672421 is a wasteful number, since it uses less digits than its factorization.

17672421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 384 counting only the distinct ones).

The product of its digits is 4704, while the sum is 30.

The square root of 17672421 is about 4203.8578710513. The cubic root of 17672421 is about 260.4745819293.

The spelling of 17672421 in words is "seventeen million, six hundred seventy-two thousand, four hundred twenty-one".