1797423840 has 72 divisors (see below), whose sum is σ = 6133713768. Its totient is φ = 479312640.

The previous prime is 1797423833. The next prime is 1797423841. The reversal of 1797423840 is 483247971.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1797423841) 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, 622666 + ... + 625545.

It is an arithmetic number, because the mean of its divisors is an integer number (85190469).

Almost surely, 2^1797423840 is an apocalyptic number.

1797423840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1797423840 is an abundant number, since it is smaller than the sum of its proper divisors (4336289928).

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

1797423840 is a wasteful number, since it uses less digits than its factorization.

1797423840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248232 (or 1248221 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 1797423840 is about 42396.0356637269. The cubic root of 1797423840 is about 1215.8597988751.

It can be divided in two parts, 17974 and 23840, that added together give a palindrome (41814).

The spelling of 1797423840 in words is "one billion, seven hundred ninety-seven million, four hundred twenty-three thousand, eight hundred forty".