402025551 has 8 divisors (see below), whose sum is σ = 541341744. Its totient is φ = 265363200.

The previous prime is 402025543. The next prime is 402025553. The reversal of 402025551 is 155520204.

It is a happy number.

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

It is not a de Polignac number, because 402025551 - 2³ = 402025543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402025553) 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, 663106 + ... + 663711.

It is an arithmetic number, because the mean of its divisors is an integer number (67667718).

Almost surely, 2^402025551 is an apocalyptic number.

402025551 is a deficient number, since it is larger than the sum of its proper divisors (139316193).

402025551 is a wasteful number, since it uses less digits than its factorization.

402025551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326921.

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 402025551 is about 20050.5748296651. The cubic root of 402025551 is about 738.0479052488.

Adding to 402025551 its reverse (155520204), we get a palindrome (557545755).

It can be divided in two parts, 40202 and 5551, that added together give a triangular number (45753 = T₃₀₂).

The spelling of 402025551 in words is "four hundred two million, twenty-five thousand, five hundred fifty-one".