402801121 has 8 divisors (see below), whose sum is σ = 425571200. Its totient is φ = 380188080.

The previous prime is 402801089. The next prime is 402801127. The reversal of 402801121 is 121108204.

It is a happy number.

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 402801121 - 2⁵ = 402801089 is a prime.

It is a super-3 number, since 3×402801121³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402801127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33966 + ... + 44263.

It is an arithmetic number, because the mean of its divisors is an integer number (53196400).

Almost surely, 2^402801121 is an apocalyptic number.

It is an amenable number.

402801121 is a deficient number, since it is larger than the sum of its proper divisors (22770079).

402801121 is a wasteful number, since it uses less digits than its factorization.

402801121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78519.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 402801121 is about 20069.9058542884. The cubic root of 402801121 is about 738.5222035601.

Adding to 402801121 its reverse (121108204), we get a palindrome (523909325).

The spelling of 402801121 in words is "four hundred two million, eight hundred one thousand, one hundred twenty-one".