378885989 has 2 divisors, whose sum is σ = 378885990. Its totient is φ = 378885988.

The previous prime is 378885959. The next prime is 378886007. The reversal of 378885989 is 989588873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 374229025 + 4656964 = 19345^2 + 2158^2 .

It is a cyclic number.

It is not a de Polignac number, because 378885989 - 2²⁰ = 377837413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378885959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189442994 + 189442995.

It is an arithmetic number, because the mean of its divisors is an integer number (189442995).

Almost surely, 2^378885989 is an apocalyptic number.

It is an amenable number.

378885989 is a deficient number, since it is larger than the sum of its proper divisors (1).

378885989 is an equidigital number, since it uses as much as digits as its factorization.

378885989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34836480, while the sum is 65.

The square root of 378885989 is about 19464.9939378362. The cubic root of 378885989 is about 723.6071483946.

The spelling of 378885989 in words is "three hundred seventy-eight million, eight hundred eighty-five thousand, nine hundred eighty-nine".