1290949343 has 4 divisors (see below), whose sum is σ = 1291349688. Its totient is φ = 1290549000.

The previous prime is 1290949339. The next prime is 1290949369. The reversal of 1290949343 is 3439490921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3439490921 = 139 ⋅24744539.

It is a cyclic number.

It is not a de Polignac number, because 1290949343 - 2² = 1290949339 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1290949294 and 1290949303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1290949333) 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, 195296 + ... + 201797.

It is an arithmetic number, because the mean of its divisors is an integer number (322837422).

Almost surely, 2^1290949343 is an apocalyptic number.

1290949343 is a deficient number, since it is larger than the sum of its proper divisors (400345).

1290949343 is an equidigital number, since it uses as much as digits as its factorization.

1290949343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400344.

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 1290949343 is about 35929.7835089498. The cubic root of 1290949343 is about 1088.8542074223.

The spelling of 1290949343 in words is "one billion, two hundred ninety million, nine hundred forty-nine thousand, three hundred forty-three".