403989697 has 4 divisors (see below), whose sum is σ = 410837040. Its totient is φ = 397142356.

The previous prime is 403989689. The next prime is 403989709. The reversal of 403989697 is 796989304.

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 403989697 - 2³ = 403989689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (403989617) 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, 3423583 + ... + 3423700.

It is an arithmetic number, because the mean of its divisors is an integer number (102709260).

Almost surely, 2^403989697 is an apocalyptic number.

It is an amenable number.

403989697 is a deficient number, since it is larger than the sum of its proper divisors (6847343).

403989697 is an equidigital number, since it uses as much as digits as its factorization.

403989697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6847342.

The product of its (nonzero) digits is 2939328, while the sum is 55.

The square root of 403989697 is about 20099.4949439034. The cubic root of 403989697 is about 739.2478948475.

The spelling of 403989697 in words is "four hundred three million, nine hundred eighty-nine thousand, six hundred ninety-seven".