402001123 has 4 divisors (see below), whose sum is σ = 403079248. Its totient is φ = 400923000.

The previous prime is 402001111. The next prime is 402001133. The reversal of 402001123 is 321100204.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402001123 is a prime.

It is a super-2 number, since 2×402001123² = 323209805786522258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402001133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 538503 + ... + 539248.

It is an arithmetic number, because the mean of its divisors is an integer number (100769812).

Almost surely, 2^402001123 is an apocalyptic number.

402001123 is a deficient number, since it is larger than the sum of its proper divisors (1078125).

402001123 is a wasteful number, since it uses less digits than its factorization.

402001123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078124.

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 402001123 is about 20049.9656608185. The cubic root of 402001123 is about 738.0329564482.

Adding to 402001123 its reverse (321100204), we get a palindrome (723101327).

The spelling of 402001123 in words is "four hundred two million, one thousand, one hundred twenty-three".