4097421 has 6 divisors (see below), whose sum is σ = 5918510. Its totient is φ = 2731608.

The previous prime is 4097393. The next prime is 4097441. The reversal of 4097421 is 1247904.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3861225 + 236196 = 1965^2 + 486^2 .

It is not a de Polignac number, because 4097421 - 2⁵ = 4097389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4097441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 227626 + ... + 227643.

Almost surely, 2^4097421 is an apocalyptic number.

It is an amenable number.

4097421 is a deficient number, since it is larger than the sum of its proper divisors (1821089).

4097421 is a wasteful number, since it uses less digits than its factorization.

4097421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455275 (or 455272 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 4097421 is about 2024.2087342959. The cubic root of 4097421 is about 160.0185004649.

It can be divided in two parts, 40 and 97421, that added together give a triangular number (97461 = T₄₄₁).

The spelling of 4097421 in words is "four million, ninety-seven thousand, four hundred twenty-one".