378693881 has 2 divisors, whose sum is σ = 378693882. Its totient is φ = 378693880.

The previous prime is 378693871. The next prime is 378693929. The reversal of 378693881 is 188396873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 372837481 + 5856400 = 19309^2 + 2420^2 .

It is a cyclic number.

It is not a de Polignac number, because 378693881 - 2¹⁸ = 378431737 is a prime.

It is a super-2 number, since 2×378693881² = 286818111013684322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (378693871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189346940 + 189346941.

It is an arithmetic number, because the mean of its divisors is an integer number (189346941).

Almost surely, 2^378693881 is an apocalyptic number.

It is an amenable number.

378693881 is a deficient number, since it is larger than the sum of its proper divisors (1).

378693881 is an equidigital number, since it uses as much as digits as its factorization.

378693881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 53.

The square root of 378693881 is about 19460.0586073115. The cubic root of 378693881 is about 723.4848299601.

The spelling of 378693881 in words is "three hundred seventy-eight million, six hundred ninety-three thousand, eight hundred eighty-one".