4057421 has 4 divisors (see below), whose sum is σ = 4103100. Its totient is φ = 4011744.

The previous prime is 4057409. The next prime is 4057423. The reversal of 4057421 is 1247504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 835396 + 3222025 = 914^2 + 1795^2 .

It is a cyclic number.

It is not a de Polignac number, because 4057421 - 2⁶ = 4057357 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4057423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22706 + ... + 22883.

It is an arithmetic number, because the mean of its divisors is an integer number (1025775).

Almost surely, 2^4057421 is an apocalyptic number.

It is an amenable number.

4057421 is a deficient number, since it is larger than the sum of its proper divisors (45679).

4057421 is an equidigital number, since it uses as much as digits as its factorization.

4057421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45678.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 4057421 is about 2014.3040981937. The cubic root of 4057421 is about 159.4960838653.

The spelling of 4057421 in words is "four million, fifty-seven thousand, four hundred twenty-one".