407666391 has 32 divisors (see below), whose sum is σ = 614780928. Its totient is φ = 238143840.

The previous prime is 407666387. The next prime is 407666411. The reversal of 407666391 is 193666704.

It is not a de Polignac number, because 407666391 - 2² = 407666387 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (407666351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101956 + ... + 105878.

It is an arithmetic number, because the mean of its divisors is an integer number (19211904).

Almost surely, 2^407666391 is an apocalyptic number.

407666391 is a deficient number, since it is larger than the sum of its proper divisors (207114537).

407666391 is a wasteful number, since it uses less digits than its factorization.

407666391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4051.

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 407666391 is about 20190.7501346532. The cubic root of 407666391 is about 741.4837474974.

The spelling of 407666391 in words is "four hundred seven million, six hundred sixty-six thousand, three hundred ninety-one".