402881789 has 4 divisors (see below), whose sum is σ = 413770524. Its totient is φ = 391993056.

The previous prime is 402881753. The next prime is 402881803. The reversal of 402881789 is 987188204.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 180364900 + 222516889 = 13430^2 + 14917^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402881789 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 (402886789) 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, 5444312 + ... + 5444385.

It is an arithmetic number, because the mean of its divisors is an integer number (103442631).

Almost surely, 2^402881789 is an apocalyptic number.

It is an amenable number.

402881789 is a deficient number, since it is larger than the sum of its proper divisors (10888735).

402881789 is a wasteful number, since it uses less digits than its factorization.

402881789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10888734.

The product of its (nonzero) digits is 258048, while the sum is 47.

The square root of 402881789 is about 20071.9154292758. The cubic root of 402881789 is about 738.5715009507.

The spelling of 402881789 in words is "four hundred two million, eight hundred eighty-one thousand, seven hundred eighty-nine".