4122781 has 8 divisors (see below), whose sum is σ = 4484480. Its totient is φ = 3767472.

The previous prime is 4122779. The next prime is 4122827. The reversal of 4122781 is 1872214.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 4122781 - 2¹ = 4122779 is a prime.

It is a super-2 number, since 2×4122781² = 33994646347922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4122731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201 + ... + 2878.

It is an arithmetic number, because the mean of its divisors is an integer number (560560).

Almost surely, 2^4122781 is an apocalyptic number.

It is an amenable number.

4122781 is a deficient number, since it is larger than the sum of its proper divisors (361699).

4122781 is a wasteful number, since it uses less digits than its factorization.

4122781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3195.

The product of its digits is 896, while the sum is 25.

The square root of 4122781 is about 2030.4632476359. The cubic root of 4122781 is about 160.3479536904.

Subtracting from 4122781 its sum of digits (25), we obtain a triangular number (4122756 = T₂₈₇₁).

Adding to 4122781 its reverse (1872214), we get a palindrome (5994995).

It can be divided in two parts, 41 and 22781, that added together give a palindrome (22822).

The spelling of 4122781 in words is "four million, one hundred twenty-two thousand, seven hundred eighty-one".