402661816 has 8 divisors (see below), whose sum is σ = 754990920. Its totient is φ = 201330904.

The previous prime is 402661811. The next prime is 402661817. The reversal of 402661816 is 618166204.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402661811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25166356 + ... + 25166371.

It is an arithmetic number, because the mean of its divisors is an integer number (94373865).

Almost surely, 2^402661816 is an apocalyptic number.

It is an amenable number.

402661816 is a deficient number, since it is larger than the sum of its proper divisors (352329104).

402661816 is a wasteful number, since it uses less digits than its factorization.

402661816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50332733 (or 50332729 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 402661816 is about 20066.4350595715. The cubic root of 402661816 is about 738.4370567449.

The spelling of 402661816 in words is "four hundred two million, six hundred sixty-one thousand, eight hundred sixteen".