6240781 has 4 divisors (see below), whose sum is σ = 6279232. Its totient is φ = 6202332.

The previous prime is 6240757. The next prime is 6240791. The reversal of 6240781 is 1870426.

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: 1870426 = 2 ⋅935213.

It is a cyclic number.

It is not a de Polignac number, because 6240781 - 2⁵ = 6240749 is a prime.

It is a super-2 number, since 2×6240781² = 77894694979922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6240701) 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, 18981 + ... + 19306.

It is an arithmetic number, because the mean of its divisors is an integer number (1569808).

Almost surely, 2^6240781 is an apocalyptic number.

It is an amenable number.

6240781 is a deficient number, since it is larger than the sum of its proper divisors (38451).

6240781 is a wasteful number, since it uses less digits than its factorization.

6240781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38450.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 6240781 is about 2498.1555195784. The cubic root of 6240781 is about 184.1109621345.

It can be divided in two parts, 6240 and 781, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 6240781 in words is "six million, two hundred forty thousand, seven hundred eighty-one".