378975981 has 8 divisors (see below), whose sum is σ = 513585184. Its totient is φ = 248508720.

The previous prime is 378975967. The next prime is 378976007. The reversal of 378975981 is 189579873.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 378975981 - 2¹⁰ = 378974957 is a prime.

It is a super-2 number, since 2×378975981² = 287245588349824722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378975911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1035271 + ... + 1035636.

It is an arithmetic number, because the mean of its divisors is an integer number (64198148).

Almost surely, 2^378975981 is an apocalyptic number.

It is an amenable number.

378975981 is a deficient number, since it is larger than the sum of its proper divisors (134609203).

378975981 is a wasteful number, since it uses less digits than its factorization.

378975981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2070971.

The product of its digits is 3810240, while the sum is 57.

The square root of 378975981 is about 19467.3054375792. The cubic root of 378975981 is about 723.6644336127.

The spelling of 378975981 in words is "three hundred seventy-eight million, nine hundred seventy-five thousand, nine hundred eighty-one".