405670987 has 16 divisors (see below), whose sum is σ = 435840768. Its totient is φ = 376659360.

The previous prime is 405670973. The next prime is 405670999. The reversal of 405670987 is 789076504.

It is a happy number.

It is not a de Polignac number, because 405670987 - 2¹⁹ = 405146699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405670907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169912 + ... + 172282.

It is an arithmetic number, because the mean of its divisors is an integer number (27240048).

Almost surely, 2^405670987 is an apocalyptic number.

405670987 is a deficient number, since it is larger than the sum of its proper divisors (30169781).

405670987 is a wasteful number, since it uses less digits than its factorization.

405670987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2610.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 405670987 is about 20141.2757043838. The cubic root of 405670987 is about 740.2719885252.

The spelling of 405670987 in words is "four hundred five million, six hundred seventy thousand, nine hundred eighty-seven".