402534661 has 8 divisors (see below), whose sum is σ = 420502464. Its totient is φ = 384605760.

The previous prime is 402534647. The next prime is 402534673. The reversal of 402534661 is 166435204.

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 402534661 - 2⁷ = 402534533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402534611) 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, 12541 + ... + 31021.

It is an arithmetic number, because the mean of its divisors is an integer number (52562808).

Almost surely, 2^402534661 is an apocalyptic number.

It is an amenable number.

402534661 is a deficient number, since it is larger than the sum of its proper divisors (17967803).

402534661 is a wasteful number, since it uses less digits than its factorization.

402534661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19451.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 402534661 is about 20063.2664588795. The cubic root of 402534661 is about 738.3593191782.

Adding to 402534661 its reverse (166435204), we get a palindrome (568969865).

The spelling of 402534661 in words is "four hundred two million, five hundred thirty-four thousand, six hundred sixty-one".