406901987 has 16 divisors (see below), whose sum is σ = 457760160. Its totient is φ = 359751168.

The previous prime is 406901981. The next prime is 406902017. The reversal of 406901987 is 789109604.

It is a cyclic number.

It is not a de Polignac number, because 406901987 - 2²⁰ = 405853411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406901981) 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, 7088 + ... + 29394.

It is an arithmetic number, because the mean of its divisors is an integer number (28610010).

Almost surely, 2^406901987 is an apocalyptic number.

406901987 is a deficient number, since it is larger than the sum of its proper divisors (50858173).

406901987 is a wasteful number, since it uses less digits than its factorization.

406901987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22390.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 406901987 is about 20171.8116935490. The cubic root of 406901987 is about 741.0200122931.

The spelling of 406901987 in words is "four hundred six million, nine hundred one thousand, nine hundred eighty-seven".