402978889 has 8 divisors (see below), whose sum is σ = 421839360. Its totient is φ = 384484800.

The previous prime is 402978817. The next prime is 402978899. The reversal of 402978889 is 988879204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 402978889 - 2²¹ = 400881737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402978899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89344 + ... + 93745.

It is an arithmetic number, because the mean of its divisors is an integer number (52729920).

Almost surely, 2^402978889 is an apocalyptic number.

It is an amenable number.

402978889 is a deficient number, since it is larger than the sum of its proper divisors (18860471).

402978889 is a wasteful number, since it uses less digits than its factorization.

402978889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183191.

The product of its (nonzero) digits is 2322432, while the sum is 55.

The square root of 402978889 is about 20074.3340860911. The cubic root of 402978889 is about 738.6308314492.

The spelling of 402978889 in words is "four hundred two million, nine hundred seventy-eight thousand, eight hundred eighty-nine".