4371921 has 8 divisors (see below), whose sum is σ = 6476960. Its totient is φ = 2914596.

The previous prime is 4371911. The next prime is 4371937. The reversal of 4371921 is 1291734.

It is not a de Polignac number, because 4371921 - 2¹⁷ = 4240849 is a prime.

It is a super-2 number, since 2×4371921² = 38227386460482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 161923 = 4371921 / (4 + 3 + 7 + 1 + 9 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

4371921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4371911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80935 + ... + 80988.

It is an arithmetic number, because the mean of its divisors is an integer number (809620).

Almost surely, 2^4371921 is an apocalyptic number.

It is an amenable number.

4371921 is a deficient number, since it is larger than the sum of its proper divisors (2105039).

4371921 is a wasteful number, since it uses less digits than its factorization.

4371921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161932 (or 161926 counting only the distinct ones).

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

The square root of 4371921 is about 2090.9139150142. The cubic root of 4371921 is about 163.5149384550.

The spelling of 4371921 in words is "four million, three hundred seventy-one thousand, nine hundred twenty-one".