1218780408 has 32 divisors (see below), whose sum is σ = 3047806800. Its totient is φ = 406146048.

The previous prime is 1218780389. The next prime is 1218780463. The reversal of 1218780408 is 8040878121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161160 + ... + 168552.

Almost surely, 2^1218780408 is an apocalyptic number.

It is an amenable number.

1218780408 is an abundant number, since it is smaller than the sum of its proper divisors (1829026392).

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

1218780408 is a wasteful number, since it uses less digits than its factorization.

1218780408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14271 (or 14267 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 39.

The square root of 1218780408 is about 34911.0356191277. The cubic root of 1218780408 is about 1068.1735539749.

The spelling of 1218780408 in words is "one billion, two hundred eighteen million, seven hundred eighty thousand, four hundred eight".