197890649 has 8 divisors (see below), whose sum is σ = 219420480. Its totient is φ = 176950800.

The previous prime is 197890631. The next prime is 197890691. The reversal of 197890649 is 946098791.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 197890649 - 2¹² = 197886553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 197890649.

It is not an unprimeable number, because it can be changed into a prime (197890619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146789 + ... + 148130.

It is an arithmetic number, because the mean of its divisors is an integer number (27427560).

Almost surely, 2^197890649 is an apocalyptic number.

It is an amenable number.

197890649 is a deficient number, since it is larger than the sum of its proper divisors (21529831).

197890649 is a wasteful number, since it uses less digits than its factorization.

197890649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294991.

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 197890649 is about 14067.3611242479. The cubic root of 197890649 is about 582.7403506280.

The spelling of 197890649 in words is "one hundred ninety-seven million, eight hundred ninety thousand, six hundred forty-nine".