340389389 has 4 divisors (see below), whose sum is σ = 358304640. Its totient is φ = 322474140.

The previous prime is 340389377. The next prime is 340389403. The reversal of 340389389 is 983983043.

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, and also an emirpimes, since its reverse is a distinct semiprime: 983983043 = 601 ⋅1637243.

It is a cyclic number.

It is not a de Polignac number, because 340389389 - 2¹⁶ = 340323853 is a prime.

It is a super-2 number, since 2×340389389² = 231729872287586642, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340389319) 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, 8957597 + ... + 8957634.

It is an arithmetic number, because the mean of its divisors is an integer number (89576160).

Almost surely, 2^340389389 is an apocalyptic number.

It is an amenable number.

340389389 is a deficient number, since it is larger than the sum of its proper divisors (17915251).

340389389 is a wasteful number, since it uses less digits than its factorization.

340389389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17915250.

The product of its (nonzero) digits is 559872, while the sum is 47.

The square root of 340389389 is about 18449.6446849255. The cubic root of 340389389 is about 698.2195494116.

The spelling of 340389389 in words is "three hundred forty million, three hundred eighty-nine thousand, three hundred eighty-nine".