197902990 has 16 divisors (see below), whose sum is σ = 356491440. Its totient is φ = 79102080.

The previous prime is 197902987. The next prime is 197903003. The reversal of 197902990 is 99209791.

It is a self number, because there is not a number n which added to its sum of digits gives 197902990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8245 + ... + 21535.

It is an arithmetic number, because the mean of its divisors is an integer number (22280715).

Almost surely, 2^197902990 is an apocalyptic number.

197902990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

197902990 is a deficient number, since it is larger than the sum of its proper divisors (158588450).

197902990 is a wasteful number, since it uses less digits than its factorization.

197902990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14787.

The product of its (nonzero) digits is 91854, while the sum is 46.

The square root of 197902990 is about 14067.7997568916. The cubic root of 197902990 is about 582.7524641348.

The spelling of 197902990 in words is "one hundred ninety-seven million, nine hundred two thousand, nine hundred ninety".