1340521668 has 36 divisors (see below), whose sum is σ = 3566886960. Its totient is φ = 423322416.

The previous prime is 1340521601. The next prime is 1340521681. The reversal of 1340521668 is 8661250431.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 979230 + ... + 980597.

Almost surely, 2^1340521668 is an apocalyptic number.

1340521668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1340521668 is an abundant number, since it is smaller than the sum of its proper divisors (2226365292).

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

1340521668 is a wasteful number, since it uses less digits than its factorization.

1340521668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1959856 (or 1959851 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1340521668 is about 36613.1351839746. The cubic root of 1340521668 is about 1102.6168188802.

The spelling of 1340521668 in words is "one billion, three hundred forty million, five hundred twenty-one thousand, six hundred sixty-eight".