1181020 has 12 divisors (see below), whose sum is σ = 2480184. Its totient is φ = 472400.

The previous prime is 1181017. The next prime is 1181023. The reversal of 1181020 is 201811.

1181020 = T₄₈₁ + T₄₈₂ + ... + T₄₉₀.

It is an interprime number because it is at equal distance from previous prime (1181017) and next prime (1181023).

It is an Ulam number.

It is a zygodrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1181023) 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, 29506 + ... + 29545.

It is an arithmetic number, because the mean of its divisors is an integer number (206682).

2^1181020 is an apocalyptic number.

1181020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1181020 is an abundant number, since it is smaller than the sum of its proper divisors (1299164).

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

1181020 is a wasteful number, since it uses less digits than its factorization.

1181020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59060 (or 59058 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1181020 is about 1086.7474407607. The cubic root of 1181020 is about 105.7026196734.

Adding to 1181020 its reverse (201811), we get a palindrome (1382831).

The spelling of 1181020 in words is "one million, one hundred eighty-one thousand, twenty".