402123401 has 4 divisors (see below), whose sum is σ = 411475152. Its totient is φ = 392771652.

The previous prime is 402123373. The next prime is 402123427. The reversal of 402123401 is 104321204.

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 402123401 - 2¹⁰ = 402122377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 402123401.

It is not an unprimeable number, because it can be changed into a prime (402123461) 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 3 ways as a sum of consecutive naturals, for example, 4675811 + ... + 4675896.

It is an arithmetic number, because the mean of its divisors is an integer number (102868788).

Almost surely, 2^402123401 is an apocalyptic number.

It is an amenable number.

402123401 is a deficient number, since it is larger than the sum of its proper divisors (9351751).

402123401 is an equidigital number, since it uses as much as digits as its factorization.

402123401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9351750.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 402123401 is about 20053.0147608782. The cubic root of 402123401 is about 738.1077788306.

Adding to 402123401 its reverse (104321204), we get a palindrome (506444605).

The spelling of 402123401 in words is "four hundred two million, one hundred twenty-three thousand, four hundred one".