407985781 has 16 divisors (see below), whose sum is σ = 472096768. Its totient is φ = 345351600.

The previous prime is 407985769. The next prime is 407985817. The reversal of 407985781 is 187589704.

It is a cyclic number.

It is not a de Polignac number, because 407985781 - 2⁷ = 407985653 is a prime.

It is a super-2 number, since 2×407985781² = 332904794996359922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (407985181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 411196 + ... + 412186.

It is an arithmetic number, because the mean of its divisors is an integer number (29506048).

Almost surely, 2^407985781 is an apocalyptic number.

It is an amenable number.

407985781 is a deficient number, since it is larger than the sum of its proper divisors (64110987).

407985781 is a wasteful number, since it uses less digits than its factorization.

407985781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1672.

The product of its (nonzero) digits is 564480, while the sum is 49.

The square root of 407985781 is about 20198.6579009597. The cubic root of 407985781 is about 741.6773377135.

The spelling of 407985781 in words is "four hundred seven million, nine hundred eighty-five thousand, seven hundred eighty-one".