1365840 has 120 divisors (see below), whose sum is σ = 5261568. Its totient is φ = 311040.

The previous prime is 1365821. The next prime is 1365869. The reversal of 1365840 is 485631.

1365840 is a `hidden beast` number, since 1 + 3 + 658 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4905 + ... + 5175.

2^1365840 is an apocalyptic number.

1365840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1365840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2630784).

1365840 is an abundant number, since it is smaller than the sum of its proper divisors (3895728).

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

1365840 is a wasteful number, since it uses less digits than its factorization.

1365840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1365840 is about 1168.6915760798. The cubic root of 1365840 is about 110.9515249742.

The spelling of 1365840 in words is "one million, three hundred sixty-five thousand, eight hundred forty".