340388987 has 2 divisors, whose sum is σ = 340388988. Its totient is φ = 340388986.

The previous prime is 340388963. The next prime is 340389041. The reversal of 340388987 is 789883043.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 340388987 - 2¹⁰ = 340387963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (340388947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 170194493 + 170194494.

It is an arithmetic number, because the mean of its divisors is an integer number (170194494).

Almost surely, 2^340388987 is an apocalyptic number.

340388987 is a deficient number, since it is larger than the sum of its proper divisors (1).

340388987 is an equidigital number, since it uses as much as digits as its factorization.

340388987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The square root of 340388987 is about 18449.6337904035. The cubic root of 340388987 is about 698.2192745456.

The spelling of 340388987 in words is "three hundred forty million, three hundred eighty-eight thousand, nine hundred eighty-seven".