1988121 has 8 divisors (see below), whose sum is σ = 2722624. Its totient is φ = 1289520.

The previous prime is 1988113. The next prime is 1988137. The reversal of 1988121 is 1218891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1988121 - 2³ = 1988113 is a prime.

It is a super-2 number, since 2×1988121² = 7905250221282, which contains 22 as substring.

It is a Duffinian number.

1988121 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1988101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8845 + ... + 9066.

It is an arithmetic number, because the mean of its divisors is an integer number (340328).

2^1988121 is an apocalyptic number.

It is an amenable number.

1988121 is a deficient number, since it is larger than the sum of its proper divisors (734503).

1988121 is a wasteful number, since it uses less digits than its factorization.

1988121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17951.

The product of its digits is 1152, while the sum is 30.

The square root of 1988121 is about 1410.0074467888. The cubic root of 1988121 is about 125.7421661279.

The spelling of 1988121 in words is "one million, nine hundred eighty-eight thousand, one hundred twenty-one".