190665387 has 48 divisors (see below), whose sum is σ = 328839840. Its totient is φ = 108725760.

The previous prime is 190665367. The next prime is 190665389. The reversal of 190665387 is 783566091.

It is a happy number.

It is not a de Polignac number, because 190665387 - 2⁸ = 190665131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (190665389) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 53823 + ... + 57255.

It is an arithmetic number, because the mean of its divisors is an integer number (6850830).

Almost surely, 2^190665387 is an apocalyptic number.

190665387 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

190665387 is a deficient number, since it is larger than the sum of its proper divisors (138174453).

190665387 is a wasteful number, since it uses less digits than its factorization.

190665387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3481 (or 3464 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 190665387 is about 13808.1637808943. The cubic root of 190665387 is about 575.5600209944.

The spelling of 190665387 in words is "one hundred ninety million, six hundred sixty-five thousand, three hundred eighty-seven".