4078621 has 4 divisors (see below), whose sum is σ = 4188892. Its totient is φ = 3968352.

The previous prime is 4078619. The next prime is 4078631. The reversal of 4078621 is 1268704.

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 3956121 + 122500 = 1989^2 + 350^2 .

It is a cyclic number.

It is not a de Polignac number, because 4078621 - 2¹ = 4078619 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4078621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4078601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55080 + ... + 55153.

It is an arithmetic number, because the mean of its divisors is an integer number (1047223).

Almost surely, 2^4078621 is an apocalyptic number.

4078621 is the 1080-th centered heptagonal number.

It is an amenable number.

4078621 is a deficient number, since it is larger than the sum of its proper divisors (110271).

4078621 is a wasteful number, since it uses less digits than its factorization.

4078621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110270.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 4078621 is about 2019.5596054586. The cubic root of 4078621 is about 159.7733901388.

The spelling of 4078621 in words is "four million, seventy-eight thousand, six hundred twenty-one".