1797990 has 32 divisors (see below), whose sum is σ = 4379616. Its totient is φ = 472320.

The previous prime is 1797967. The next prime is 1798001. The reversal of 1797990 is 997971.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1780 + ... + 2600.

It is an arithmetic number, because the mean of its divisors is an integer number (136863).

2^1797990 is an apocalyptic number.

1797990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1797990 is the 1095-th pentagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1797990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2189808).

1797990 is an abundant number, since it is smaller than the sum of its proper divisors (2581626).

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

1797990 is a wasteful number, since it uses less digits than its factorization.

1797990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904.

The product of its (nonzero) digits is 35721, while the sum is 42.

The square root of 1797990 is about 1340.8914944916. The cubic root of 1797990 is about 121.5987444324.

The spelling of 1797990 in words is "one million, seven hundred ninety-seven thousand, nine hundred ninety".