1361640 has 64 divisors (see below), whose sum is σ = 4671360. Its totient is φ = 311040.

The previous prime is 1361629. The next prime is 1361677. The reversal of 1361640 is 461631.

1361640 = T₁₂₇ + T₁₂₈ + ... + T₂₁₆.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30 + ... + 1650.

It is an arithmetic number, because the mean of its divisors is an integer number (72990).

2^1361640 is an apocalyptic number.

1361640 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 1361640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2335680).

1361640 is an abundant number, since it is smaller than the sum of its proper divisors (3309720).

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

1361640 is a wasteful number, since it uses less digits than its factorization.

1361640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642 (or 1638 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1361640 is about 1166.8933113186. The cubic root of 1361640 is about 110.8376817535.

Subtracting from 1361640 its reverse (461631), we obtain a palindrome (900009).

The spelling of 1361640 in words is "one million, three hundred sixty-one thousand, six hundred forty".