388602989 has 2 divisors, whose sum is σ = 388602990. Its totient is φ = 388602988.

The previous prime is 388602979. The next prime is 388603031. The reversal of 388602989 is 989206883.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 355020964 + 33582025 = 18842^2 + 5795^2 .

It is a cyclic number.

It is not a de Polignac number, because 388602989 - 2¹⁶ = 388537453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 388602989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (388602919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194301494 + 194301495.

It is an arithmetic number, because the mean of its divisors is an integer number (194301495).

Almost surely, 2^388602989 is an apocalyptic number.

It is an amenable number.

388602989 is a deficient number, since it is larger than the sum of its proper divisors (1).

388602989 is an equidigital number, since it uses as much as digits as its factorization.

388602989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1492992, while the sum is 53.

The square root of 388602989 is about 19713.0157256570. The cubic root of 388602989 is about 729.7409407912.

The spelling of 388602989 in words is "three hundred eighty-eight million, six hundred two thousand, nine hundred eighty-nine".