1538320734 has 24 divisors (see below), whose sum is σ = 3456474840. Its totient is φ = 512773416.

The previous prime is 1538320733. The next prime is 1538320739. The reversal of 1538320734 is 4370238351.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1538320733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1582149 + ... + 1583120.

It is an arithmetic number, because the mean of its divisors is an integer number (144019785).

Almost surely, 2^1538320734 is an apocalyptic number.

1538320734 is an abundant number, since it is smaller than the sum of its proper divisors (1918154106).

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

1538320734 is an equidigital number, since it uses as much as digits as its factorization.

1538320734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3165286 (or 3165274 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 1538320734 is about 39221.4320748236. The cubic root of 1538320734 is about 1154.3804536998.

The spelling of 1538320734 in words is "one billion, five hundred thirty-eight million, three hundred twenty thousand, seven hundred thirty-four".