402881669 has 4 divisors (see below), whose sum is σ = 404906400. Its totient is φ = 400856940.

The previous prime is 402881651. The next prime is 402881683. The reversal of 402881669 is 966188204.

It is a happy number.

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 402881669 - 2¹⁶ = 402816133 is a prime.

It is a super-2 number, since 2×402881669² = 324627278432451122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402881629) 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, 1012067 + ... + 1012464.

It is an arithmetic number, because the mean of its divisors is an integer number (101226600).

Almost surely, 2^402881669 is an apocalyptic number.

It is an amenable number.

402881669 is a deficient number, since it is larger than the sum of its proper divisors (2024731).

402881669 is a wasteful number, since it uses less digits than its factorization.

402881669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2024730.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 402881669 is about 20071.9124400242. The cubic root of 402881669 is about 738.5714276219.

The spelling of 402881669 in words is "four hundred two million, eight hundred eighty-one thousand, six hundred sixty-nine".