378658981 has 4 divisors (see below), whose sum is σ = 378766732. Its totient is φ = 378551232.

The previous prime is 378658967. The next prime is 378658993. The reversal of 378658981 is 189856873.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34222500 + 344436481 = 5850^2 + 18559^2 .

It is a cyclic number.

It is not a de Polignac number, because 378658981 - 2¹¹ = 378656933 is a prime.

It is a super-2 number, since 2×378658981² = 286765247783916722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378658381) 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 in 3 ways as a sum of consecutive naturals, for example, 48420 + ... + 55693.

It is an arithmetic number, because the mean of its divisors is an integer number (94691683).

Almost surely, 2^378658981 is an apocalyptic number.

It is an amenable number.

378658981 is a deficient number, since it is larger than the sum of its proper divisors (107751).

378658981 is a wasteful number, since it uses less digits than its factorization.

378658981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107750.

The product of its digits is 2903040, while the sum is 55.

The square root of 378658981 is about 19459.1618781488. The cubic root of 378658981 is about 723.4626040960.

The spelling of 378658981 in words is "three hundred seventy-eight million, six hundred fifty-eight thousand, nine hundred eighty-one".