190978815 has 8 divisors (see below), whose sum is σ = 305566128. Its totient is φ = 101855360.

The previous prime is 190978771. The next prime is 190978819. The reversal of 190978815 is 518879091.

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

It is not a de Polignac number, because 190978815 - 2⁶ = 190978751 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (190978819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6365946 + ... + 6365975.

It is an arithmetic number, because the mean of its divisors is an integer number (38195766).

Almost surely, 2^190978815 is an apocalyptic number.

190978815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

190978815 is a deficient number, since it is larger than the sum of its proper divisors (114587313).

190978815 is a wasteful number, since it uses less digits than its factorization.

190978815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12731929.

The product of its (nonzero) digits is 181440, while the sum is 48.

The square root of 190978815 is about 13819.5084934306. The cubic root of 190978815 is about 575.8752291715.

The spelling of 190978815 in words is "one hundred ninety million, nine hundred seventy-eight thousand, eight hundred fifteen".