4992921 has 18 divisors (see below), whose sum is σ = 7498842. Its totient is φ = 3324240.

The previous prime is 4992919. The next prime is 4992929. The reversal of 4992921 is 1292994.

4992921 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2624400 + 2368521 = 1620^2 + 1539^2 .

It is not a de Polignac number, because 4992921 - 2¹ = 4992919 is a prime.

It is a super-2 number, since 2×4992921² = 49858520224482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4992929) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 6181 + ... + 6941.

Almost surely, 2^4992921 is an apocalyptic number.

It is an amenable number.

4992921 is a deficient number, since it is larger than the sum of its proper divisors (2505921).

4992921 is an frugal number, since it uses more digits than its factorization.

4992921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785 (or 764 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 4992921 is about 2234.4845043097. The cubic root of 4992921 is about 170.9168570881.

The spelling of 4992921 in words is "four million, nine hundred ninety-two thousand, nine hundred twenty-one".