4158781 has 4 divisors (see below), whose sum is σ = 4536864. Its totient is φ = 3780700.

The previous prime is 4158779. The next prime is 4158809. The reversal of 4158781 is 1878514.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 4158781 - 2¹ = 4158779 is a prime.

It is a super-2 number, since 2×4158781² = 34590918811922, which contains 22 as substring.

It is a Duffinian number.

4158781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4158731) 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, 189025 + ... + 189046.

It is an arithmetic number, because the mean of its divisors is an integer number (1134216).

Almost surely, 2^4158781 is an apocalyptic number.

It is an amenable number.

4158781 is a deficient number, since it is larger than the sum of its proper divisors (378083).

4158781 is a wasteful number, since it uses less digits than its factorization.

4158781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378082.

The product of its digits is 8960, while the sum is 34.

The square root of 4158781 is about 2039.3089515814. The cubic root of 4158781 is about 160.8133196272.

The spelling of 4158781 in words is "four million, one hundred fifty-eight thousand, seven hundred eighty-one".