2238278387 has 2 divisors, whose sum is σ = 2238278388. Its totient is φ = 2238278386.

The previous prime is 2238278359. The next prime is 2238278401. The reversal of 2238278387 is 7838728322.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2238278387 is a prime.

It is a super-2 number, since 2×2238278387² = 10019780275422643538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2238278687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1119139193 + 1119139194.

It is an arithmetic number, because the mean of its divisors is an integer number (1119139194).

Almost surely, 2^2238278387 is an apocalyptic number.

2238278387 is a deficient number, since it is larger than the sum of its proper divisors (1).

2238278387 is an equidigital number, since it uses as much as digits as its factorization.

2238278387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1806336, while the sum is 50.

The square root of 2238278387 is about 47310.4469118608. The cubic root of 2238278387 is about 1308.0912292153.

The spelling of 2238278387 in words is "two billion, two hundred thirty-eight million, two hundred seventy-eight thousand, three hundred eighty-seven".