1988451 has 6 divisors (see below), whose sum is σ = 2872220. Its totient is φ = 1325628.

The previous prime is 1988423. The next prime is 1988453. The reversal of 1988451 is 1548891.

It is not a de Polignac number, because 1988451 - 2⁷ = 1988323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1988453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110461 + ... + 110478.

2^1988451 is an apocalyptic number.

1988451 is a deficient number, since it is larger than the sum of its proper divisors (883769).

1988451 is a wasteful number, since it uses less digits than its factorization.

1988451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220945 (or 220942 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 1988451 is about 1410.1244625919. The cubic root of 1988451 is about 125.7491228841.

It can be divided in two parts, 198 and 8451, that added together give a square (8649 = 93²).

The spelling of 1988451 in words is "one million, nine hundred eighty-eight thousand, four hundred fifty-one".