4173921 has 12 divisors (see below), whose sum is σ = 6112548. Its totient is φ = 2744064.

The previous prime is 4173919. The next prime is 4173943. The reversal of 4173921 is 1293714.

It can be written as a sum of positive squares in 2 ways, for example, as 2143296 + 2030625 = 1464^2 + 1425^2 .

It is not a de Polignac number, because 4173921 - 2¹ = 4173919 is a prime.

4173921 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2520 + ... + 3833.

It is an arithmetic number, because the mean of its divisors is an integer number (509379).

Almost surely, 2^4173921 is an apocalyptic number.

It is an amenable number.

4173921 is a deficient number, since it is larger than the sum of its proper divisors (1938627).

4173921 is a wasteful number, since it uses less digits than its factorization.

4173921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6432 (or 6429 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 4173921 is about 2043.0176210694. The cubic root of 4173921 is about 161.0082297145.

The spelling of 4173921 in words is "four million, one hundred seventy-three thousand, nine hundred twenty-one".