1551798 has 48 divisors (see below), whose sum is σ = 3634176. Its totient is φ = 495720.

The previous prime is 1551793. The next prime is 1551853. The reversal of 1551798 is 8971551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1551791) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15015 + ... + 15117.

It is an arithmetic number, because the mean of its divisors is an integer number (75712).

2^1551798 is an apocalyptic number.

1551798 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1551798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1817088).

1551798 is an abundant number, since it is smaller than the sum of its proper divisors (2082378).

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

1551798 is a wasteful number, since it uses less digits than its factorization.

1551798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 139 counting only the distinct ones).

The product of its digits is 12600, while the sum is 36.

The square root of 1551798 is about 1245.7118446896. The cubic root of 1551798 is about 115.7741841563.

It can be divided in two parts, 155 and 1798, that added together give a triangular number (1953 = T₆₂).

The spelling of 1551798 in words is "one million, five hundred fifty-one thousand, seven hundred ninety-eight".