1366739820 has 72 divisors (see below), whose sum is σ = 4389656544. Its totient is φ = 343024128.

The previous prime is 1366739809. The next prime is 1366739839. The reversal of 1366739820 is 289376631.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 220264 + ... + 226383.

It is an arithmetic number, because the mean of its divisors is an integer number (60967452).

Almost surely, 2^1366739820 is an apocalyptic number.

1366739820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1366739820 is an abundant number, since it is smaller than the sum of its proper divisors (3022916724).

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

1366739820 is a wasteful number, since it uses less digits than its factorization.

1366739820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446679 (or 446674 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 1366739820 is about 36969.4444102153. Note that the first 4 decimals coincide. The cubic root of 1366739820 is about 1109.7588470521.

It can be divided in two parts, 136 and 6739820, that added together give a triangular number (6739956 = T₃₆₇₁).

The spelling of 1366739820 in words is "one billion, three hundred sixty-six million, seven hundred thirty-nine thousand, eight hundred twenty".