4052781 has 16 divisors (see below), whose sum is σ = 6035200. Its totient is φ = 2687904.

The previous prime is 4052777. The next prime is 4052791. The reversal of 4052781 is 1872504.

It is not a de Polignac number, because 4052781 - 2² = 4052777 is a prime.

It is a super-2 number, since 2×4052781² = 32850067667922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

4052781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4052701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9705 + ... + 10113.

It is an arithmetic number, because the mean of its divisors is an integer number (377200).

Almost surely, 2^4052781 is an apocalyptic number.

It is an amenable number.

4052781 is a deficient number, since it is larger than the sum of its proper divisors (1982419).

4052781 is a wasteful number, since it uses less digits than its factorization.

4052781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785 (or 779 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 4052781 is about 2013.1520061833. The cubic root of 4052781 is about 159.4352616405.

The spelling of 4052781 in words is "four million, fifty-two thousand, seven hundred eighty-one".