1551980 has 24 divisors (see below), whose sum is σ = 3306912. Its totient is φ = 611712.

The previous prime is 1551967. The next prime is 1551997. The reversal of 1551980 is 891551.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 929 + ... + 1991.

It is an arithmetic number, because the mean of its divisors is an integer number (137788).

2^1551980 is an apocalyptic number.

1551980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1551980 is an abundant number, since it is smaller than the sum of its proper divisors (1754932).

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

1551980 is a wasteful number, since it uses less digits than its factorization.

1551980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1145 (or 1143 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 1551980 is about 1245.7848931497. The cubic root of 1551980 is about 115.7787101057.

The spelling of 1551980 in words is "one million, five hundred fifty-one thousand, nine hundred eighty".