402005551 has 8 divisors (see below), whose sum is σ = 415444608. Its totient is φ = 388596000.

The previous prime is 402005543. The next prime is 402005557. The reversal of 402005551 is 155500204.

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 402005551 - 2³ = 402005543 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 (402005557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22281 + ... + 36061.

It is an arithmetic number, because the mean of its divisors is an integer number (51930576).

Almost surely, 2^402005551 is an apocalyptic number.

402005551 is a deficient number, since it is larger than the sum of its proper divisors (13439057).

402005551 is a wasteful number, since it uses less digits than its factorization.

402005551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14753.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 402005551 is about 20050.0760846437. The cubic root of 402005551 is about 738.0356662233.

Adding to 402005551 its reverse (155500204), we get a palindrome (557505755).

The spelling of 402005551 in words is "four hundred two million, five thousand, five hundred fifty-one".