1071998 has 4 divisors (see below), whose sum is σ = 1608000. Its totient is φ = 535998.

The previous prime is 1071991. The next prime is 1072009. The reversal of 1071998 is 8991701.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8991701 = 79 ⋅113819.

It is a super-2 number, since 2×1071998² = 2298359424008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1071991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 267998 + ... + 268001.

It is an arithmetic number, because the mean of its divisors is an integer number (402000).

2^1071998 is an apocalyptic number.

1071998 is a deficient number, since it is larger than the sum of its proper divisors (536002).

1071998 is an equidigital number, since it uses as much as digits as its factorization.

1071998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536001.

The product of its (nonzero) digits is 4536, while the sum is 35.

The square root of 1071998 is about 1035.3733626089. The cubic root of 1071998 is about 102.3445352911.

The spelling of 1071998 in words is "one million, seventy-one thousand, nine hundred ninety-eight".