347440021 has 8 divisors (see below), whose sum is σ = 352283904. Its totient is φ = 342625920.

The previous prime is 347440019. The next prime is 347440063. The reversal of 347440021 is 120044743.

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 347440021 - 2¹ = 347440019 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (347440081) 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, 16581 + ... + 31141.

It is an arithmetic number, because the mean of its divisors is an integer number (44035488).

Almost surely, 2^347440021 is an apocalyptic number.

It is an amenable number.

347440021 is a deficient number, since it is larger than the sum of its proper divisors (4843883).

347440021 is a wasteful number, since it uses less digits than its factorization.

347440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14891.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 347440021 is about 18639.7430508041. The cubic root of 347440021 is about 703.0074825846.

Adding to 347440021 its reverse (120044743), we get a palindrome (467484764).

The spelling of 347440021 in words is "three hundred forty-seven million, four hundred forty thousand, twenty-one".