340447681 has 16 divisors (see below), whose sum is σ = 411084160. Its totient is φ = 275425920.

The previous prime is 340447663. The next prime is 340447687. The reversal of 340447681 is 186744043.

It is not a de Polignac number, because 340447681 - 2⁷ = 340447553 is a prime.

It is a super-2 number, since 2×340447681² = 231809246996555522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 340447681.

It is not an unprimeable number, because it can be changed into a prime (340447687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32221 + ... + 41461.

It is an arithmetic number, because the mean of its divisors is an integer number (25692760).

Almost surely, 2^340447681 is an apocalyptic number.

It is an amenable number.

340447681 is a deficient number, since it is larger than the sum of its proper divisors (70636479).

340447681 is a wasteful number, since it uses less digits than its factorization.

340447681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9544.

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 340447681 is about 18451.2243767182. The cubic root of 340447681 is about 698.2594040527.

The spelling of 340447681 in words is "three hundred forty million, four hundred forty-seven thousand, six hundred eighty-one".