1218782406 has 8 divisors (see below), whose sum is σ = 2437564824. Its totient is φ = 406260800.

The previous prime is 1218782401. The next prime is 1218782413. The reversal of 1218782406 is 6042878121.

It is a happy number.

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

1218782406 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218782401) 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, 101565195 + ... + 101565206.

It is an arithmetic number, because the mean of its divisors is an integer number (304695603).

Almost surely, 2^1218782406 is an apocalyptic number.

1218782406 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1218782406 is a wasteful number, since it uses less digits than its factorization.

1218782406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203130406.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 1218782406 is about 34911.0642347093. The cubic root of 1218782406 is about 1068.1741376758.

The spelling of 1218782406 in words is "one billion, two hundred eighteen million, seven hundred eighty-two thousand, four hundred six".