1340669979 has 24 divisors (see below), whose sum is σ = 2122079232. Its totient is φ = 808870320.

The previous prime is 1340669899. The next prime is 1340670007. The reversal of 1340669979 is 9799660431.

It is not a de Polignac number, because 1340669979 - 2⁹ = 1340669467 is a prime.

It is a zygodrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (1340669779) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8287 + ... + 52440.

It is an arithmetic number, because the mean of its divisors is an integer number (88419968).

Almost surely, 2^1340669979 is an apocalyptic number.

1340669979 is a deficient number, since it is larger than the sum of its proper divisors (781409253).

1340669979 is a wasteful number, since it uses less digits than its factorization.

1340669979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60967 (or 60964 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 54.

The square root of 1340669979 is about 36615.1605076367. The cubic root of 1340669979 is about 1102.6574807053.

The spelling of 1340669979 in words is "one billion, three hundred forty million, six hundred sixty-nine thousand, nine hundred seventy-nine".