4920781 has 4 divisors (see below), whose sum is σ = 5134752. Its totient is φ = 4706812.

The previous prime is 4920763. The next prime is 4920787. The reversal of 4920781 is 1870294.

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: 1870294 = 2 ⋅935147.

It is not a de Polignac number, because 4920781 - 2⁹ = 4920269 is a prime.

It is a super-2 number, since 2×4920781² = 48428171299922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 (4920787) 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, 106951 + ... + 106996.

It is an arithmetic number, because the mean of its divisors is an integer number (1283688).

Almost surely, 2^4920781 is an apocalyptic number.

It is an amenable number.

4920781 is a deficient number, since it is larger than the sum of its proper divisors (213971).

4920781 is a wasteful number, since it uses less digits than its factorization.

4920781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213970.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 4920781 is about 2218.2833452920. The cubic root of 4920781 is about 170.0896989143.

The spelling of 4920781 in words is "four million, nine hundred twenty thousand, seven hundred eighty-one".