1428705726 has 32 divisors (see below), whose sum is σ = 3304965888. Its totient is φ = 403282560.

The previous prime is 1428705647. The next prime is 1428705731. The reversal of 1428705726 is 6275078241.

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 201435 + ... + 208406.

It is an arithmetic number, because the mean of its divisors is an integer number (103280184).

Almost surely, 2^1428705726 is an apocalyptic number.

1428705726 is an abundant number, since it is smaller than the sum of its proper divisors (1876260162).

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

1428705726 is a wasteful number, since it uses less digits than its factorization.

1428705726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409936.

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 1428705726 is about 37798.2238471598. The cubic root of 1428705726 is about 1126.2831715164.

The spelling of 1428705726 in words is "one billion, four hundred twenty-eight million, seven hundred five thousand, seven hundred twenty-six".