406139847 has 4 divisors (see below), whose sum is σ = 541519800. Its totient is φ = 270759896.

The previous prime is 406139827. The next prime is 406139857. The reversal of 406139847 is 748931604.

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

It is a cyclic number.

It is not a de Polignac number, because 406139847 - 2⁷ = 406139719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 406139799 and 406139808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406139827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67689972 + ... + 67689977.

It is an arithmetic number, because the mean of its divisors is an integer number (135379950).

Almost surely, 2^406139847 is an apocalyptic number.

406139847 is a deficient number, since it is larger than the sum of its proper divisors (135379953).

406139847 is a wasteful number, since it uses less digits than its factorization.

406139847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135379952.

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 406139847 is about 20152.9116258669. The cubic root of 406139847 is about 740.5570720089.

The spelling of 406139847 in words is "four hundred six million, one hundred thirty-nine thousand, eight hundred forty-seven".