2547989 has 2 divisors, whose sum is σ = 2547990. Its totient is φ = 2547988.

The previous prime is 2547973. The next prime is 2547997. The reversal of 2547989 is 9897452.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1612900 + 935089 = 1270^2 + 967^2 .

It is a cyclic number.

It is not a de Polignac number, because 2547989 - 2⁴ = 2547973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2547929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1273994 + 1273995.

It is an arithmetic number, because the mean of its divisors is an integer number (1273995).

2^2547989 is an apocalyptic number.

It is an amenable number.

2547989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2547989 is an equidigital number, since it uses as much as digits as its factorization.

2547989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 2547989 is about 1596.2421495500. The cubic root of 2547989 is about 136.5837973389.

The spelling of 2547989 in words is "two million, five hundred forty-seven thousand, nine hundred eighty-nine".