1997635845 has 8 divisors (see below), whose sum is σ = 3196217376. Its totient is φ = 1065405776.

The previous prime is 1997635841. The next prime is 1997635897. The reversal of 1997635845 is 5485367991.

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 1997635845 - 2² = 1997635841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1997635841) 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, 66587847 + ... + 66587876.

It is an arithmetic number, because the mean of its divisors is an integer number (399527172).

Almost surely, 2^1997635845 is an apocalyptic number.

1997635845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1997635845 is a deficient number, since it is larger than the sum of its proper divisors (1198581531).

1997635845 is a wasteful number, since it uses less digits than its factorization.

1997635845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133175731.

The product of its digits is 8164800, while the sum is 57.

The square root of 1997635845 is about 44694.9196777441. The cubic root of 1997635845 is about 1259.4244127139.

The spelling of 1997635845 in words is "one billion, nine hundred ninety-seven million, six hundred thirty-five thousand, eight hundred forty-five".