407347681 has 4 divisors (see below), whose sum is σ = 438682132. Its totient is φ = 376013232.

The previous prime is 407347579. The next prime is 407347697. The reversal of 407347681 is 186743704.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24167056 + 383180625 = 4916^2 + 19575^2 .

It is a cyclic number.

It is not a de Polignac number, because 407347681 - 2¹¹ = 407345633 is a prime.

It is a super-2 number, since 2×407347681² = 331864266432155522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (407047681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15667206 + ... + 15667231.

It is an arithmetic number, because the mean of its divisors is an integer number (109670533).

Almost surely, 2^407347681 is an apocalyptic number.

It is an amenable number.

407347681 is a deficient number, since it is larger than the sum of its proper divisors (31334451).

407347681 is a wasteful number, since it uses less digits than its factorization.

407347681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31334450.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 407347681 is about 20182.8561160208. The cubic root of 407347681 is about 741.2904686294.

The spelling of 407347681 in words is "four hundred seven million, three hundred forty-seven thousand, six hundred eighty-one".