378138997 has 2 divisors, whose sum is σ = 378138998. Its totient is φ = 378138996.

The previous prime is 378138989. The next prime is 378139039. The reversal of 378138997 is 799831873.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 291760561 + 86378436 = 17081^2 + 9294^2 .

It is a cyclic number.

It is not a de Polignac number, because 378138997 - 2³ = 378138989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (378138907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189069498 + 189069499.

It is an arithmetic number, because the mean of its divisors is an integer number (189069499).

Almost surely, 2^378138997 is an apocalyptic number.

It is an amenable number.

378138997 is a deficient number, since it is larger than the sum of its proper divisors (1).

378138997 is an equidigital number, since it uses as much as digits as its factorization.

378138997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 55.

The square root of 378138997 is about 19445.7963837946. The cubic root of 378138997 is about 723.1312934035.

It can be divided in two parts, 3781 and 38997, that added together give a triangular number (42778 = T₂₉₂).

The spelling of 378138997 in words is "three hundred seventy-eight million, one hundred thirty-eight thousand, nine hundred ninety-seven".