345406681 has 8 divisors (see below), whose sum is σ = 375315200. Its totient is φ = 316671120.

The previous prime is 345406669. The next prime is 345406703. The reversal of 345406681 is 186604543.

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 345406681 - 2⁷ = 345406553 is a prime.

It is a super-2 number, since 2×345406681² = 238611550558871522, 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 345406681.

It is not an unprimeable number, because it can be changed into a prime (345406631) 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, 292626 + ... + 293803.

It is an arithmetic number, because the mean of its divisors is an integer number (46914400).

Almost surely, 2^345406681 is an apocalyptic number.

345406681 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

345406681 is a deficient number, since it is larger than the sum of its proper divisors (29908519).

345406681 is a wasteful number, since it uses less digits than its factorization.

345406681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586479.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 345406681 is about 18585.1198812383. The cubic root of 345406681 is about 701.6333836488.

The spelling of 345406681 in words is "three hundred forty-five million, four hundred six thousand, six hundred eighty-one".