1531730 has 16 divisors (see below), whose sum is σ = 2816640. Its totient is φ = 599472.

The previous prime is 1531729. The next prime is 1531769. The reversal of 1531730 is 371351.

It is a happy number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1160 + ... + 2099.

It is an arithmetic number, because the mean of its divisors is an integer number (176040).

2^1531730 is an apocalyptic number.

1531730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1531730 is a deficient number, since it is larger than the sum of its proper divisors (1284910).

1531730 is a wasteful number, since it uses less digits than its factorization.

1531730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3313.

The product of its (nonzero) digits is 315, while the sum is 20.

The square root of 1531730 is about 1237.6308011681. The cubic root of 1531730 is about 115.2729496319.

The spelling of 1531730 in words is "one million, five hundred thirty-one thousand, seven hundred thirty".