686394054 has 16 divisors (see below), whose sum is σ = 1525320240. Its totient is φ = 228798000.

The previous prime is 686394053. The next prime is 686394073. The reversal of 686394054 is 450493686.

686394054 is a `hidden beast` number, since 6 + 8 + 639 + 4 + 0 + 5 + 4 = 666.

It is a super-2 number, since 2×686394054² = 942273594733109832, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686394053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6355447 + ... + 6355554.

It is an arithmetic number, because the mean of its divisors is an integer number (95332515).

Almost surely, 2^686394054 is an apocalyptic number.

686394054 is an abundant number, since it is smaller than the sum of its proper divisors (838926186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686394054 is a wasteful number, since it uses less digits than its factorization.

686394054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12711012 (or 12711006 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 686394054 is about 26199.1231532660. The cubic root of 686394054 is about 882.1135723064.

The spelling of 686394054 in words is "six hundred eighty-six million, three hundred ninety-four thousand, fifty-four".