340788391 has 8 divisors (see below), whose sum is σ = 345187040. Its totient is φ = 336413088.

The previous prime is 340788361. The next prime is 340788397. The reversal of 340788391 is 193887043.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 340788391 - 2¹⁷ = 340657319 is a prime.

It is a super-2 number, since 2×340788391² = 232273454880737762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340788397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24550 + ... + 35836.

It is an arithmetic number, because the mean of its divisors is an integer number (43148380).

Almost surely, 2^340788391 is an apocalyptic number.

340788391 is a deficient number, since it is larger than the sum of its proper divisors (4398649).

340788391 is a wasteful number, since it uses less digits than its factorization.

340788391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11673.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 340788391 is about 18460.4547885473. The cubic root of 340788391 is about 698.4922588657.

The spelling of 340788391 in words is "three hundred forty million, seven hundred eighty-eight thousand, three hundred ninety-one".