378991311 has 8 divisors (see below), whose sum is σ = 505413504. Its totient is φ = 252615000.

The previous prime is 378991307. The next prime is 378991339. The reversal of 378991311 is 113199873.

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

It is not a de Polignac number, because 378991311 - 2² = 378991307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (378991351) 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, 20686 + ... + 34436.

It is an arithmetic number, because the mean of its divisors is an integer number (63176688).

Almost surely, 2^378991311 is an apocalyptic number.

378991311 is a deficient number, since it is larger than the sum of its proper divisors (126422193).

378991311 is a wasteful number, since it uses less digits than its factorization.

378991311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22941.

The product of its digits is 40824, while the sum is 42.

The square root of 378991311 is about 19467.6991706776. The cubic root of 378991311 is about 723.6741911583.

The spelling of 378991311 in words is "three hundred seventy-eight million, nine hundred ninety-one thousand, three hundred eleven".