1797917640 has 64 divisors (see below), whose sum is σ = 5579755200. Its totient is φ = 462911232.

The previous prime is 1797917621. The next prime is 1797917647. The reversal of 1797917640 is 467197971.

It is not an unprimeable number, because it can be changed into a prime (1797917647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254842 + ... + 261801.

It is an arithmetic number, because the mean of its divisors is an integer number (87183675).

Almost surely, 2^1797917640 is an apocalyptic number.

1797917640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1797917640 is an abundant number, since it is smaller than the sum of its proper divisors (3781837560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1797917640 is a wasteful number, since it uses less digits than its factorization.

1797917640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516686 (or 516682 counting only the distinct ones).

The product of its (nonzero) digits is 666792, while the sum is 51.

The square root of 1797917640 is about 42401.8589215143. The cubic root of 1797917640 is about 1215.9711316583.

The spelling of 1797917640 in words is "one billion, seven hundred ninety-seven million, nine hundred seventeen thousand, six hundred forty".