1340219649 has 4 divisors (see below), whose sum is σ = 1786959536. Its totient is φ = 893479764.

The previous prime is 1340219641. The next prime is 1340219653. The reversal of 1340219649 is 9469120431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9469120431 = 3 ⋅3156373477.

It is not a de Polignac number, because 1340219649 - 2³ = 1340219641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1340219641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223369939 + ... + 223369944.

It is an arithmetic number, because the mean of its divisors is an integer number (446739884).

Almost surely, 2^1340219649 is an apocalyptic number.

It is an amenable number.

1340219649 is a deficient number, since it is larger than the sum of its proper divisors (446739887).

1340219649 is an equidigital number, since it uses as much as digits as its factorization.

1340219649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446739886.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 1340219649 is about 36609.0104892225. The cubic root of 1340219649 is about 1102.5340062834.

The spelling of 1340219649 in words is "one billion, three hundred forty million, two hundred nineteen thousand, six hundred forty-nine".