981635 has 8 divisors (see below), whose sum is σ = 1240080. Its totient is φ = 743904.

The previous prime is 981623. The next prime is 981637. The reversal of 981635 is 536189.

Added to its reverse (536189) it gives a square (1517824 = 1232²).

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

It is a cyclic number.

It is not a de Polignac number, because 981635 - 2¹² = 977539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5072 + ... + 5261.

It is an arithmetic number, because the mean of its divisors is an integer number (155010).

2⁹⁸¹⁶³⁵ is an apocalyptic number.

981635 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

981635 is a deficient number, since it is larger than the sum of its proper divisors (258445).

981635 is a wasteful number, since it uses less digits than its factorization.

981635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10357.

The product of its digits is 6480, while the sum is 32.

The square root of 981635 is about 990.7749492190. The cubic root of 981635 is about 99.3840471438.

Adding to 981635 its reverse (536189), we get a square (1517824 = 1232²).

The spelling of 981635 in words is "nine hundred eighty-one thousand, six hundred thirty-five".