5998781 has 4 divisors (see below), whose sum is σ = 6006432. Its totient is φ = 5991132.

The previous prime is 5998763. The next prime is 5998793. The reversal of 5998781 is 1878995.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1878995 = 5 ⋅375799.

It is a cyclic number.

It is not a de Polignac number, because 5998781 - 2²² = 1804477 is a prime.

It is a super-2 number, since 2×5998781² = 71970746971922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5998721) 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, 2495 + ... + 4268.

It is an arithmetic number, because the mean of its divisors is an integer number (1501608).

Almost surely, 2^5998781 is an apocalyptic number.

It is an amenable number.

5998781 is a deficient number, since it is larger than the sum of its proper divisors (7651).

5998781 is an equidigital number, since it uses as much as digits as its factorization.

5998781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7650.

The product of its digits is 181440, while the sum is 47.

The square root of 5998781 is about 2449.2409028105. The cubic root of 5998781 is about 181.6997525053.

The spelling of 5998781 in words is "five million, nine hundred ninety-eight thousand, seven hundred eighty-one".