387226993 has 2 divisors, whose sum is σ = 387226994. Its totient is φ = 387226992.

The previous prime is 387226981. The next prime is 387227021. The reversal of 387226993 is 399622783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 383258929 + 3968064 = 19577^2 + 1992^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387226993 is a prime.

It is not a weakly prime, because it can be changed into another prime (387226913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193613496 + 193613497.

It is an arithmetic number, because the mean of its divisors is an integer number (193613497).

Almost surely, 2^387226993 is an apocalyptic number.

It is an amenable number.

387226993 is a deficient number, since it is larger than the sum of its proper divisors (1).

387226993 is an equidigital number, since it uses as much as digits as its factorization.

387226993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 49.

The square root of 387226993 is about 19678.0840784869. The cubic root of 387226993 is about 728.8786141688.

The spelling of 387226993 in words is "three hundred eighty-seven million, two hundred twenty-six thousand, nine hundred ninety-three".