3478021 has 4 divisors (see below), whose sum is σ = 3500332. Its totient is φ = 3455712.

The previous prime is 3478009. The next prime is 3478039. The reversal of 3478021 is 1208743.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1208743 = 157 ⋅7699.

It can be written as a sum of positive squares in 2 ways, for example, as 540225 + 2937796 = 735^2 + 1714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3478021 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 (3478051) 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, 10920 + ... + 11233.

It is an arithmetic number, because the mean of its divisors is an integer number (875083).

Almost surely, 2^3478021 is an apocalyptic number.

It is an amenable number.

3478021 is a deficient number, since it is larger than the sum of its proper divisors (22311).

3478021 is a wasteful number, since it uses less digits than its factorization.

3478021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22310.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 3478021 is about 1864.9453075090. The cubic root of 3478021 is about 151.5109658145.

The spelling of 3478021 in words is "three million, four hundred seventy-eight thousand, twenty-one".