685156405 has 16 divisors (see below), whose sum is σ = 835698240. Its totient is φ = 539142912.

The previous prime is 685156393. The next prime is 685156421. The reversal of 685156405 is 504651586.

It is a cyclic number.

It is not a de Polignac number, because 685156405 - 2¹³ = 685148213 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 337002 + ... + 339028.

It is an arithmetic number, because the mean of its divisors is an integer number (52231140).

Almost surely, 2^685156405 is an apocalyptic number.

It is an amenable number.

685156405 is a deficient number, since it is larger than the sum of its proper divisors (150541835).

685156405 is a wasteful number, since it uses less digits than its factorization.

685156405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3108.

The product of its (nonzero) digits is 144000, while the sum is 40.

The square root of 685156405 is about 26175.4924499999. The cubic root of 685156405 is about 881.5830685746.

The spelling of 685156405 in words is "six hundred eighty-five million, one hundred fifty-six thousand, four hundred five".