1187406 has 32 divisors (see below), whose sum is σ = 2880000. Its totient is φ = 359640.

The previous prime is 1187387. The next prime is 1187411. The reversal of 1187406 is 6047811.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1187406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 406 + ... + 1593.

It is an arithmetic number, because the mean of its divisors is an integer number (90000).

2^1187406 is an apocalyptic number.

1187406 is an abundant number, since it is smaller than the sum of its proper divisors (1692594).

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

1187406 is a wasteful number, since it uses less digits than its factorization.

1187406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021 (or 2015 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 1187406 is about 1089.6816048736. The cubic root of 1187406 is about 105.8927953753.

The spelling of 1187406 in words is "one million, one hundred eighty-seven thousand, four hundred six".