163878397 has 2 divisors, whose sum is σ = 163878398. Its totient is φ = 163878396.

The previous prime is 163878383. The next prime is 163878409. The reversal of 163878397 is 793878361.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106936281 + 56942116 = 10341^2 + 7546^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163878397 is a prime.

It is a super-2 number, since 2×163878397² = 53712258006579218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163878347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81939198 + 81939199.

It is an arithmetic number, because the mean of its divisors is an integer number (81939199).

Almost surely, 2^163878397 is an apocalyptic number.

It is an amenable number.

163878397 is a deficient number, since it is larger than the sum of its proper divisors (1).

163878397 is an equidigital number, since it uses as much as digits as its factorization.

163878397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 52.

The square root of 163878397 is about 12801.4997949459. The cubic root of 163878397 is about 547.2350456566.

The spelling of 163878397 in words is "one hundred sixty-three million, eight hundred seventy-eight thousand, three hundred ninety-seven".