340400009 has 4 divisors (see below), whose sum is σ = 342182400. Its totient is φ = 338617620.

The previous prime is 340399981. The next prime is 340400017. The reversal of 340400009 is 900004043.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340400009 is a prime.

It is a super-2 number, since 2×340400009² = 231744332254400162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340400089) 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, 890909 + ... + 891290.

It is an arithmetic number, because the mean of its divisors is an integer number (85545600).

Almost surely, 2^340400009 is an apocalyptic number.

It is an amenable number.

340400009 is a deficient number, since it is larger than the sum of its proper divisors (1782391).

340400009 is a wasteful number, since it uses less digits than its factorization.

340400009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782390.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 340400009 is about 18449.9324931014. The cubic root of 340400009 is about 698.2268107175.

The spelling of 340400009 in words is "three hundred forty million, four hundred thousand, nine".