387242749 has 2 divisors, whose sum is σ = 387242750. Its totient is φ = 387242748.

The previous prime is 387242659. The next prime is 387242831. The reversal of 387242749 is 947242783.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 262764100 + 124478649 = 16210^2 + 11157^2 .

It is a cyclic number.

It is not a de Polignac number, because 387242749 - 2⁷ = 387242621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 387242699 and 387242708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387248749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193621374 + 193621375.

It is an arithmetic number, because the mean of its divisors is an integer number (193621375).

Almost surely, 2^387242749 is an apocalyptic number.

It is an amenable number.

387242749 is a deficient number, since it is larger than the sum of its proper divisors (1).

387242749 is an equidigital number, since it uses as much as digits as its factorization.

387242749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 46.

The square root of 387242749 is about 19678.4844182676. The cubic root of 387242749 is about 728.8884998912. Note that the first 3 decimals are identical.

The spelling of 387242749 in words is "three hundred eighty-seven million, two hundred forty-two thousand, seven hundred forty-nine".