26781947 has 2 divisors, whose sum is σ = 26781948. Its totient is φ = 26781946.

The previous prime is 26781917. The next prime is 26781961. The reversal of 26781947 is 74918762.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 26781947 - 2⁶ = 26781883 is a prime.

It is a super-2 number, since 2×26781947² = 1434545370221618, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 26781898 and 26781907.

It is not a weakly prime, because it can be changed into another prime (26781917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13390973 + 13390974.

It is an arithmetic number, because the mean of its divisors is an integer number (13390974).

Almost surely, 2^26781947 is an apocalyptic number.

26781947 is a deficient number, since it is larger than the sum of its proper divisors (1).

26781947 is an equidigital number, since it uses as much as digits as its factorization.

26781947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 169344, while the sum is 44.

The square root of 26781947 is about 5175.1277278923. The cubic root of 26781947 is about 299.1902124099.

The spelling of 26781947 in words is "twenty-six million, seven hundred eighty-one thousand, nine hundred forty-seven".