1097890 has 8 divisors (see below), whose sum is σ = 1976220. Its totient is φ = 439152.

The previous prime is 1097879. The next prime is 1097891. The reversal of 1097890 is 987901.

It can be written as a sum of positive squares in 2 ways, for example, as 1096209 + 1681 = 1047^2 + 41^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1097891) 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, 54885 + ... + 54904.

2^1097890 is an apocalyptic number.

1097890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1097890 is a deficient number, since it is larger than the sum of its proper divisors (878330).

1097890 is a wasteful number, since it uses less digits than its factorization.

1097890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109796.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 1097890 is about 1047.8024622991. The cubic root of 1097890 is about 103.1619659335.

The spelling of 1097890 in words is "one million, ninety-seven thousand, eight hundred ninety".