405842087 has 12 divisors (see below), whose sum is σ = 467381040. Its totient is φ = 345213696.

The previous prime is 405842081. The next prime is 405842117. The reversal of 405842087 is 780248504.

It is not a de Polignac number, because 405842087 - 2¹⁰ = 405841063 is a prime.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 405842087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405842081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129839 + ... + 132927.

It is an arithmetic number, because the mean of its divisors is an integer number (38948420).

Almost surely, 2^405842087 is an apocalyptic number.

405842087 is a deficient number, since it is larger than the sum of its proper divisors (61538953).

405842087 is an equidigital number, since it uses as much as digits as its factorization.

405842087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3370 (or 3233 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 38.

The square root of 405842087 is about 20145.5227532075. The cubic root of 405842087 is about 740.3760488255.

The spelling of 405842087 in words is "four hundred five million, eight hundred forty-two thousand, eighty-seven".