197749643 has 12 divisors (see below), whose sum is σ = 247731120. Its totient is φ = 156460752.

The previous prime is 197749639. The next prime is 197749649. The reversal of 197749643 is 346947791.

It is a happy number.

It is not a de Polignac number, because 197749643 - 2² = 197749639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 197749591 and 197749600.

It is not an unprimeable number, because it can be changed into a prime (197749649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154583 + ... + 155856.

It is an arithmetic number, because the mean of its divisors is an integer number (20644260).

Almost surely, 2^197749643 is an apocalyptic number.

197749643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

197749643 is a deficient number, since it is larger than the sum of its proper divisors (49981477).

197749643 is a wasteful number, since it uses less digits than its factorization.

197749643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310466 (or 310459 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 50.

The square root of 197749643 is about 14062.3484169608. The cubic root of 197749643 is about 582.6019081589.

The spelling of 197749643 in words is "one hundred ninety-seven million, seven hundred forty-nine thousand, six hundred forty-three".