197216398 has 8 divisors (see below), whose sum is σ = 308686608. Its totient is φ = 94320864.

The previous prime is 197216359. The next prime is 197216399. The reversal of 197216398 is 893612791.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (46), and also a Moran number because the ratio is a prime number: 4287313 = 197216398 / (1 + 9 + 7 + 2 + 1 + 6 + 3 + 9 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197216399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2143611 + ... + 2143702.

It is an arithmetic number, because the mean of its divisors is an integer number (38585826).

Almost surely, 2^197216398 is an apocalyptic number.

197216398 is the 7507-th centered heptagonal number.

197216398 is a deficient number, since it is larger than the sum of its proper divisors (111470210).

197216398 is a wasteful number, since it uses less digits than its factorization.

197216398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4287338.

The product of its digits is 163296, while the sum is 46.

The square root of 197216398 is about 14043.3755913598. The cubic root of 197216398 is about 582.0777618766.

The spelling of 197216398 in words is "one hundred ninety-seven million, two hundred sixteen thousand, three hundred ninety-eight".