406878251 has 4 divisors (see below), whose sum is σ = 438176592. Its totient is φ = 375579912.

The previous prime is 406878239. The next prime is 406878253. The reversal of 406878251 is 152878604.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406878251 is a prime.

It is a super-2 number, since 2×406878251² = 331099822273638002, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 406878199 and 406878208.

It is not an unprimeable number, because it can be changed into a prime (406878253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15649151 + ... + 15649176.

It is an arithmetic number, because the mean of its divisors is an integer number (109544148).

Almost surely, 2^406878251 is an apocalyptic number.

406878251 is a deficient number, since it is larger than the sum of its proper divisors (31298341).

406878251 is a wasteful number, since it uses less digits than its factorization.

406878251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31298340.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 406878251 is about 20171.2233392028. The cubic root of 406878251 is about 741.0056032596.

The spelling of 406878251 in words is "four hundred six million, eight hundred seventy-eight thousand, two hundred fifty-one".