2428781 has 2 divisors, whose sum is σ = 2428782. Its totient is φ = 2428780.

The previous prime is 2428771. The next prime is 2428787. The reversal of 2428781 is 1878242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2353156 + 75625 = 1534^2 + 275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2428781 is a prime.

It is a super-2 number, since 2×2428781² = 11797954291922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2428787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1214390 + 1214391.

It is an arithmetic number, because the mean of its divisors is an integer number (1214391).

2^2428781 is an apocalyptic number.

It is an amenable number.

2428781 is a deficient number, since it is larger than the sum of its proper divisors (1).

2428781 is an equidigital number, since it uses as much as digits as its factorization.

2428781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7168, while the sum is 32.

The square root of 2428781 is about 1558.4546833322. The cubic root of 2428781 is about 134.4196578448.

The spelling of 2428781 in words is "two million, four hundred twenty-eight thousand, seven hundred eighty-one".