1366978040 has 32 divisors (see below), whose sum is σ = 3080151360. Its totient is φ = 546000000.

The previous prime is 1366978031. The next prime is 1366978043. The reversal of 1366978040 is 408796631.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1366977982 and 1366978000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366978043) 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, 3665 + ... + 52415.

It is an arithmetic number, because the mean of its divisors is an integer number (96254730).

Almost surely, 2^1366978040 is an apocalyptic number.

1366978040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1366978040 is an abundant number, since it is smaller than the sum of its proper divisors (1713173320).

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

1366978040 is a wasteful number, since it uses less digits than its factorization.

1366978040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49463 (or 49459 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 1366978040 is about 36972.6661197161. Note that the first 3 decimals coincide. The cubic root of 1366978040 is about 1109.8233195510.

The spelling of 1366978040 in words is "one billion, three hundred sixty-six million, nine hundred seventy-eight thousand, forty".