856079407 has 2 divisors, whose sum is σ = 856079408. Its totient is φ = 856079406.

The previous prime is 856079369. The next prime is 856079443. The reversal of 856079407 is 704970658.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-856079407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (856070407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428039703 + 428039704.

It is an arithmetic number, because the mean of its divisors is an integer number (428039704).

Almost surely, 2^856079407 is an apocalyptic number.

856079407 is a deficient number, since it is larger than the sum of its proper divisors (1).

856079407 is an equidigital number, since it uses as much as digits as its factorization.

856079407 is an evil number, because the sum of its binary digits is even.

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

The square root of 856079407 is about 29258.8346828783. The cubic root of 856079407 is about 949.5212387274.

The spelling of 856079407 in words is "eight hundred fifty-six million, seventy-nine thousand, four hundred seven".