345447731 has 8 divisors (see below), whose sum is σ = 352261728. Its totient is φ = 338688000.

The previous prime is 345447719. The next prime is 345447733. The reversal of 345447731 is 137744543.

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 a de Polignac number, because none of the positive numbers 2^k-345447731 is a prime.

It is a super-2 number, since 2×345447731² = 238668269706096722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (345447733) 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, 590 + ... + 26291.

It is an arithmetic number, because the mean of its divisors is an integer number (44032716).

Almost surely, 2^345447731 is an apocalyptic number.

345447731 is a deficient number, since it is larger than the sum of its proper divisors (6813997).

345447731 is a wasteful number, since it uses less digits than its factorization.

345447731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27133.

The product of its digits is 141120, while the sum is 38.

The square root of 345447731 is about 18586.2242265609. The cubic root of 345447731 is about 701.6611778511.

The spelling of 345447731 in words is "three hundred forty-five million, four hundred forty-seven thousand, seven hundred thirty-one".