4992781 has 8 divisors (see below), whose sum is σ = 5306040. Its totient is φ = 4681728.

The previous prime is 4992769. The next prime is 4992787. The reversal of 4992781 is 1872994.

It can be written as a sum of positive squares in 4 ways, for example, as 3802500 + 1190281 = 1950^2 + 1091^2 .

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 4992781 - 2¹³ = 4984589 is a prime.

It is a super-2 number, since 2×4992781² = 49855724227922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4992787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8365 + ... + 8941.

It is an arithmetic number, because the mean of its divisors is an integer number (663255).

Almost surely, 2^4992781 is an apocalyptic number.

It is an amenable number.

4992781 is a deficient number, since it is larger than the sum of its proper divisors (313259).

4992781 is a wasteful number, since it uses less digits than its factorization.

4992781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103.

The product of its digits is 36288, while the sum is 40.

The square root of 4992781 is about 2234.4531769540. The cubic root of 4992781 is about 170.9152595874.

The spelling of 4992781 in words is "four million, nine hundred ninety-two thousand, seven hundred eighty-one".