1361409660 has 384 divisors, whose sum is σ = 4910976000. Its totient is φ = 310293504.

The previous prime is 1361409587. The next prime is 1361409667. The reversal of 1361409660 is 669041631.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361409667) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 7869334 + ... + 7869506.

It is an arithmetic number, because the mean of its divisors is an integer number (12789000).

Almost surely, 2^1361409660 is an apocalyptic number.

1361409660 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 1361409660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2455488000).

1361409660 is an abundant number, since it is smaller than the sum of its proper divisors (3549566340).

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

1361409660 is a wasteful number, since it uses less digits than its factorization.

1361409660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 1361409660 is about 36897.2852659921. The cubic root of 1361409660 is about 1108.3143149857.

The spelling of 1361409660 in words is "one billion, three hundred sixty-one million, four hundred nine thousand, six hundred sixty".