340687999 has 4 divisors (see below), whose sum is σ = 340822080. Its totient is φ = 340553920.

The previous prime is 340687979. The next prime is 340688003. The reversal of 340687999 is 999786043.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999786043 = 28607 ⋅34949.

It is a cyclic number.

It is not a de Polignac number, because 340687999 - 2⁵ = 340687967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340687909) 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, 63154 + ... + 68335.

It is an arithmetic number, because the mean of its divisors is an integer number (85205520).

Almost surely, 2^340687999 is an apocalyptic number.

340687999 is a deficient number, since it is larger than the sum of its proper divisors (134081).

340687999 is a wasteful number, since it uses less digits than its factorization.

340687999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134080.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The square root of 340687999 is about 18457.7354786550. The cubic root of 340687999 is about 698.4236631001.

The spelling of 340687999 in words is "three hundred forty million, six hundred eighty-seven thousand, nine hundred ninety-nine".