187197490 has 16 divisors (see below), whose sum is σ = 344792448. Its totient is φ = 73137456.

The previous prime is 187197457. The next prime is 187197497. The reversal of 187197490 is 94791781.

It is a self number, because there is not a number n which added to its sum of digits gives 187197490.

It is not an unprimeable number, because it can be changed into a prime (187197497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217242 + ... + 218101.

It is an arithmetic number, because the mean of its divisors is an integer number (21549528).

Almost surely, 2^187197490 is an apocalyptic number.

187197490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

187197490 is a deficient number, since it is larger than the sum of its proper divisors (157594958).

187197490 is a wasteful number, since it uses less digits than its factorization.

187197490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435393.

The product of its (nonzero) digits is 127008, while the sum is 46.

The square root of 187197490 is about 13682.0133752310. The cubic root of 187197490 is about 572.0491444727.

The spelling of 187197490 in words is "one hundred eighty-seven million, one hundred ninety-seven thousand, four hundred ninety".