1340681340 has 48 divisors (see below), whose sum is σ = 3771734400. Its totient is φ = 355817280.

The previous prime is 1340681311. The next prime is 1340681359. The reversal of 1340681340 is 431860431.

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 = 1340681298 and 1340681307.

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, 40290 + ... + 65609.

It is an arithmetic number, because the mean of its divisors is an integer number (78577800).

Almost surely, 2^1340681340 is an apocalyptic number.

1340681340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1340681340 is an abundant number, since it is smaller than the sum of its proper divisors (2431053060).

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

1340681340 is a wasteful number, since it uses less digits than its factorization.

1340681340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106122 (or 106120 counting only the distinct ones).

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

The square root of 1340681340 is about 36615.3156479635. The cubic root of 1340681340 is about 1102.6605953809.

The spelling of 1340681340 in words is "one billion, three hundred forty million, six hundred eighty-one thousand, three hundred forty".