1187890 has 16 divisors (see below), whose sum is σ = 2332800. Its totient is φ = 431920.

The previous prime is 1187887. The next prime is 1187897. The reversal of 1187890 is 987811.

It is a super-2 number, since 2×1187890² = 2822165304200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5290 + ... + 5509.

It is an arithmetic number, because the mean of its divisors is an integer number (145800).

2^1187890 is an apocalyptic number.

1187890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1187890 is a deficient number, since it is larger than the sum of its proper divisors (1144910).

1187890 is a wasteful number, since it uses less digits than its factorization.

1187890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10817.

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 1187890 is about 1089.9036654677. The cubic root of 1187890 is about 105.9071811178.

It can be divided in two parts, 118 and 7890, that added together give a palindrome (8008).

The spelling of 1187890 in words is "one million, one hundred eighty-seven thousand, eight hundred ninety".