1387994418 has 24 divisors (see below), whose sum is σ = 3008311488. Its totient is φ = 462512472.

The previous prime is 1387994417. The next prime is 1387994423. The reversal of 1387994418 is 8144997831.

1387994418 is a `hidden beast` number, since 138 + 7 + 9 + 94 + 418 = 666.

1387994418 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1387994417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52555 + ... + 74417.

It is an arithmetic number, because the mean of its divisors is an integer number (125346312).

Almost surely, 2^1387994418 is an apocalyptic number.

1387994418 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1387994418 is an abundant number, since it is smaller than the sum of its proper divisors (1620317070).

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

1387994418 is a wasteful number, since it uses less digits than its factorization.

1387994418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25398 (or 25395 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 1387994418 is about 37255.7971059539. The cubic root of 1387994418 is about 1115.4820167200.

The spelling of 1387994418 in words is "one billion, three hundred eighty-seven million, nine hundred ninety-four thousand, four hundred eighteen".