1098749 has 4 divisors (see below), whose sum is σ = 1104636. Its totient is φ = 1092864.

The previous prime is 1098737. The next prime is 1098787. The reversal of 1098749 is 9478901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9478901 = 31 ⋅305771.

It can be written as a sum of positive squares in 2 ways, for example, as 196249 + 902500 = 443^2 + 950^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1098749 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1098709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2654 + ... + 3039.

It is an arithmetic number, because the mean of its divisors is an integer number (276159).

2^1098749 is an apocalyptic number.

It is an amenable number.

1098749 is a deficient number, since it is larger than the sum of its proper divisors (5887).

1098749 is an equidigital number, since it uses as much as digits as its factorization.

1098749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5886.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 1098749 is about 1048.2122876593. The cubic root of 1098749 is about 103.1888639006.

The spelling of 1098749 in words is "one million, ninety-eight thousand, seven hundred forty-nine".