4378981 has 2 divisors, whose sum is σ = 4378982. Its totient is φ = 4378980.

The previous prime is 4378963. The next prime is 4379003. The reversal of 4378981 is 1898734.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3629025 + 749956 = 1905^2 + 866^2 .

It is a cyclic number.

It is not a de Polignac number, because 4378981 - 2¹³ = 4370789 is a prime.

It is a super-2 number, since 2×4378981² = 38350949196722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4378951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2189490 + 2189491.

It is an arithmetic number, because the mean of its divisors is an integer number (2189491).

Almost surely, 2^4378981 is an apocalyptic number.

It is an amenable number.

4378981 is a deficient number, since it is larger than the sum of its proper divisors (1).

4378981 is an equidigital number, since it uses as much as digits as its factorization.

4378981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 40.

The square root of 4378981 is about 2092.6014909676. The cubic root of 4378981 is about 163.6029085273.

The spelling of 4378981 in words is "four million, three hundred seventy-eight thousand, nine hundred eighty-one".