407987989 has 4 divisors (see below), whose sum is σ = 408029056. Its totient is φ = 407946924.

The previous prime is 407987977. The next prime is 407988013. The reversal of 407987989 is 989789704.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 407987989 - 2²⁵ = 374433557 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 (407987929) 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, 4732 + ... + 28954.

It is an arithmetic number, because the mean of its divisors is an integer number (102007264).

Almost surely, 2^407987989 is an apocalyptic number.

It is an amenable number.

407987989 is a deficient number, since it is larger than the sum of its proper divisors (41067).

407987989 is a wasteful number, since it uses less digits than its factorization.

407987989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41066.

The product of its (nonzero) digits is 9144576, while the sum is 61.

The square root of 407987989 is about 20198.7125579825. The cubic root of 407987989 is about 741.6786756854.

The spelling of 407987989 in words is "four hundred seven million, nine hundred eighty-seven thousand, nine hundred eighty-nine".