1880021 has 8 divisors (see below), whose sum is σ = 2208864. Its totient is φ = 1577520.

The previous prime is 1880017. The next prime is 1880023. The reversal of 1880021 is 1200881.

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 1880021 - 2² = 1880017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1879975 and 1880002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1880023) 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, 6431 + ... + 6716.

It is an arithmetic number, because the mean of its divisors is an integer number (276108).

2^1880021 is an apocalyptic number.

1880021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1880021 is a deficient number, since it is larger than the sum of its proper divisors (328843).

1880021 is a wasteful number, since it uses less digits than its factorization.

1880021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13171.

The product of its (nonzero) digits is 128, while the sum is 20.

The square root of 1880021 is about 1371.1385779709. The cubic root of 1880021 is about 123.4205753968.

The spelling of 1880021 in words is "one million, eight hundred eighty thousand, twenty-one".