1897980 has 48 divisors (see below), whose sum is σ = 6074880. Its totient is φ = 433728.

The previous prime is 1897979. The next prime is 1897991. The reversal of 1897980 is 897981.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an Ulam number.

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, 1840 + ... + 2679.

It is an arithmetic number, because the mean of its divisors is an integer number (126560).

2^1897980 is an apocalyptic number.

1897980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1897980 is an abundant number, since it is smaller than the sum of its proper divisors (4176900).

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

1897980 is a wasteful number, since it uses less digits than its factorization.

1897980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4538 (or 4536 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 1897980 is about 1377.6719493406. The cubic root of 1897980 is about 123.8123244882.

Subtracting from 1897980 its reverse (897981), we obtain a palindrome (999999).

The spelling of 1897980 in words is "one million, eight hundred ninety-seven thousand, nine hundred eighty".