407389681 has 4 divisors (see below), whose sum is σ = 413470192. Its totient is φ = 401309172.

The previous prime is 407389637. The next prime is 407389687. The reversal of 407389681 is 186983704.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 407389681 - 2¹⁵ = 407356913 is a prime.

It is a super-2 number, since 2×407389681² = 331932704370563522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (407389687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3040155 + ... + 3040288.

It is an arithmetic number, because the mean of its divisors is an integer number (103367548).

Almost surely, 2^407389681 is an apocalyptic number.

It is an amenable number.

407389681 is a deficient number, since it is larger than the sum of its proper divisors (6080511).

407389681 is an equidigital number, since it uses as much as digits as its factorization.

407389681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6080510.

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 407389681 is about 20183.8965762313. The cubic root of 407389681 is about 741.3159449249.

The spelling of 407389681 in words is "four hundred seven million, three hundred eighty-nine thousand, six hundred eighty-one".