402135641 has 4 divisors (see below), whose sum is σ = 406117284. Its totient is φ = 398154000.

The previous prime is 402135637. The next prime is 402135649. The reversal of 402135641 is 146531204.

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

It can be written as a sum of positive squares in 2 ways, for example, as 171217225 + 230918416 = 13085^2 + 15196^2 .

It is a cyclic number.

It is not a de Polignac number, because 402135641 - 2² = 402135637 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 402135641.

It is not an unprimeable number, because it can be changed into a prime (402135649) 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, 1990670 + ... + 1990871.

It is an arithmetic number, because the mean of its divisors is an integer number (101529321).

Almost surely, 2^402135641 is an apocalyptic number.

It is an amenable number.

402135641 is a deficient number, since it is larger than the sum of its proper divisors (3981643).

402135641 is a wasteful number, since it uses less digits than its factorization.

402135641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3981642.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 402135641 is about 20053.3199495744. The cubic root of 402135641 is about 738.1152676989.

Adding to 402135641 its reverse (146531204), we get a palindrome (548666845).

It can be divided in two parts, 40213 and 5641, that added together give a palindrome (45854).

The spelling of 402135641 in words is "four hundred two million, one hundred thirty-five thousand, six hundred forty-one".