684143705 has 16 divisors (see below), whose sum is σ = 938684160. Its totient is φ = 468912192.

The previous prime is 684143693. The next prime is 684143711. The reversal of 684143705 is 507341486.

It is not a de Polignac number, because 684143705 - 2¹⁴ = 684127321 is a prime.

It is a super-2 number, since 2×684143705² = 936105218182254050, which contains 22 as substring.

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, 129251 + ... + 134439.

It is an arithmetic number, because the mean of its divisors is an integer number (58667760).

Almost surely, 2^684143705 is an apocalyptic number.

It is an amenable number.

684143705 is a deficient number, since it is larger than the sum of its proper divisors (254540455).

684143705 is a wasteful number, since it uses less digits than its factorization.

684143705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8968.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 684143705 is about 26156.1408659611. The cubic root of 684143705 is about 881.1485111568.

It can be divided in two parts, 68414 and 3705, that multiplied together give a triangular number (253473870 = T₂₂₅₁₅).

The spelling of 684143705 in words is "six hundred eighty-four million, one hundred forty-three thousand, seven hundred five".