1340361840 has 160 divisors (see below), whose sum is σ = 4399361280. Its totient is φ = 336642048.

The previous prime is 1340361829. The next prime is 1340361871. The reversal of 1340361840 is 481630431.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1340361798 and 1340361807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 879319 + ... + 880841.

It is an arithmetic number, because the mean of its divisors is an integer number (27496008).

Almost surely, 2^1340361840 is an apocalyptic number.

1340361840 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 1340361840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2199680640).

1340361840 is an abundant number, since it is smaller than the sum of its proper divisors (3058999440).

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

1340361840 is a wasteful number, since it uses less digits than its factorization.

1340361840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751 (or 1745 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1340361840 is about 36610.9524596124. The cubic root of 1340361840 is about 1102.5729961284.

The spelling of 1340361840 in words is "one billion, three hundred forty million, three hundred sixty-one thousand, eight hundred forty".