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1981098 = 23471747
BaseRepresentation
bin111100011101010101010
310201122120000
413203222222
51001343343
6110243430
722560540
oct7435252
93648500
101981098
111133479
127b6576
13544962
14397d90
15291ed3
hex1e3aaa

1981098 has 40 divisors (see below), whose sum is σ = 5076192. Its totient is φ = 565704.

The previous prime is 1981093. The next prime is 1981099. The reversal of 1981098 is 8901891.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1981093) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 261 + ... + 2007.

21981098 is an apocalyptic number.

1981098 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 1981098, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2538096).

1981098 is an abundant number, since it is smaller than the sum of its proper divisors (3095094).

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

1981098 is a wasteful number, since it uses less digits than its factorization.

1981098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768 (or 1759 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 1981098 is about 1407.5148311830. The cubic root of 1981098 is about 125.5939308331.

It can be divided in two parts, 198 and 1098, that added together give a 4-th power (1296 = 64).

The spelling of 1981098 in words is "one million, nine hundred eighty-one thousand, ninety-eight".