4048781 has 6 divisors (see below), whose sum is σ = 4450446. Its totient is φ = 3680600.

The previous prime is 4048769. The next prime is 4048783. The reversal of 4048781 is 1878404.

It can be written as a sum of positive squares in only one way, i.e., 3455881 + 592900 = 1859^2 + 770^2 .

It is a de Polignac number, because none of the positive numbers 2^k-4048781 is a prime.

It is a super-2 number, since 2×4048781² = 32785255171922, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4048783) 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, 16610 + ... + 16851.

It is an arithmetic number, because the mean of its divisors is an integer number (741741).

Almost surely, 2^4048781 is an apocalyptic number.

It is an amenable number.

4048781 is a deficient number, since it is larger than the sum of its proper divisors (401665).

4048781 is a wasteful number, since it uses less digits than its factorization.

4048781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33483 (or 33472 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 4048781 is about 2012.1582939719. The cubic root of 4048781 is about 159.3827914171.

The spelling of 4048781 in words is "four million, forty-eight thousand, seven hundred eighty-one".