1117890 has 24 divisors (see below), whose sum is σ = 2906748. Its totient is φ = 298080.

The previous prime is 1117889. The next prime is 1117901. The reversal of 1117890 is 987111.

It can be written as a sum of positive squares in 2 ways, for example, as 1058841 + 59049 = 1029^2 + 243^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6121 + ... + 6300.

2^1117890 is an apocalyptic number.

1117890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1117890 is an abundant number, since it is smaller than the sum of its proper divisors (1788858).

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

1117890 is a wasteful number, since it uses less digits than its factorization.

1117890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12434 (or 12431 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 27.

The square root of 1117890 is about 1057.3031731722. The cubic root of 1117890 is about 103.7846257872.

It can be divided in two parts, 111 and 7890, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 1117890 in words is "one million, one hundred seventeen thousand, eight hundred ninety".