1728731406 has 16 divisors (see below), whose sum is σ = 3462075648. Its totient is φ = 575475000.

The previous prime is 1728731401. The next prime is 1728731419. The reversal of 1728731406 is 6041378271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1728731401) 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, 187320 + ... + 196331.

It is an arithmetic number, because the mean of its divisors is an integer number (216379728).

Almost surely, 2^1728731406 is an apocalyptic number.

1728731406 is an abundant number, since it is smaller than the sum of its proper divisors (1733344242).

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

1728731406 is a wasteful number, since it uses less digits than its factorization.

1728731406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384407.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 1728731406 is about 41578.0158978275. The cubic root of 1728731406 is about 1200.1692830627.

The spelling of 1728731406 in words is "one billion, seven hundred twenty-eight million, seven hundred thirty-one thousand, four hundred six".