146978389 has 2 divisors, whose sum is σ = 146978390. Its totient is φ = 146978388.

The previous prime is 146978387. The next prime is 146978401. The reversal of 146978389 is 983879641.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144600625 + 2377764 = 12025^2 + 1542^2 .

It is a cyclic number.

It is not a de Polignac number, because 146978389 - 2¹ = 146978387 is a prime.

Together with 146978387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146978387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73489194 + 73489195.

It is an arithmetic number, because the mean of its divisors is an integer number (73489195).

Almost surely, 2^146978389 is an apocalyptic number.

It is an amenable number.

146978389 is a deficient number, since it is larger than the sum of its proper divisors (1).

146978389 is an equidigital number, since it uses as much as digits as its factorization.

146978389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 55.

The square root of 146978389 is about 12123.4643976052. The cubic root of 146978389 is about 527.7373447322.

The spelling of 146978389 in words is "one hundred forty-six million, nine hundred seventy-eight thousand, three hundred eighty-nine".