1340143997 has 2 divisors, whose sum is σ = 1340143998. Its totient is φ = 1340143996.

The previous prime is 1340143951. The next prime is 1340144011. The reversal of 1340143997 is 7993410431.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1329769156 + 10374841 = 36466^2 + 3221^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340143997 - 2⁸ = 1340143741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340143907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670071998 + 670071999.

It is an arithmetic number, because the mean of its divisors is an integer number (670071999).

Almost surely, 2^1340143997 is an apocalyptic number.

It is an amenable number.

1340143997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340143997 is an equidigital number, since it uses as much as digits as its factorization.

1340143997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 1340143997 is about 36607.9772317455. The cubic root of 1340143997 is about 1102.5132608103.

The spelling of 1340143997 in words is "one billion, three hundred forty million, one hundred forty-three thousand, nine hundred ninety-seven".