190978361 has 16 divisors (see below), whose sum is σ = 229146624. Its totient is φ = 155619024.

The previous prime is 190978303. The next prime is 190978387. The reversal of 190978361 is 163879091.

It is a cyclic number.

It is not a de Polignac number, because 190978361 - 2⁶ = 190978297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (190978661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23336 + ... + 30438.

It is an arithmetic number, because the mean of its divisors is an integer number (14321664).

Almost surely, 2^190978361 is an apocalyptic number.

It is an amenable number.

190978361 is a deficient number, since it is larger than the sum of its proper divisors (38168263).

190978361 is a wasteful number, since it uses less digits than its factorization.

190978361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7300.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 190978361 is about 13819.4920673663. The cubic root of 190978361 is about 575.8747728425.

The spelling of 190978361 in words is "one hundred ninety million, nine hundred seventy-eight thousand, three hundred sixty-one".