402135401 has 4 divisors (see below), whose sum is σ = 402441600. Its totient is φ = 401829204.

The previous prime is 402135389. The next prime is 402135443. The reversal of 402135401 is 104531204.

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 a de Polignac number, because none of the positive numbers 2^k-402135401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402135451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151121 + ... + 153758.

It is an arithmetic number, because the mean of its divisors is an integer number (100610400).

Almost surely, 2^402135401 is an apocalyptic number.

It is an amenable number.

402135401 is a deficient number, since it is larger than the sum of its proper divisors (306199).

402135401 is a wasteful number, since it uses less digits than its factorization.

402135401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306198.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 402135401 is about 20053.3139655270. The cubic root of 402135401 is about 738.1151208598.

Adding to 402135401 its reverse (104531204), we get a palindrome (506666605).

The spelling of 402135401 in words is "four hundred two million, one hundred thirty-five thousand, four hundred one".