1538731 has 2 divisors, whose sum is σ = 1538732. Its totient is φ = 1538730.

The previous prime is 1538701. The next prime is 1538743. The reversal of 1538731 is 1378351.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1538731 - 2¹¹ = 1536683 is a prime.

It is a super-4 number, since 4×1538731⁴ (a number of 26 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 1538731.

It is not a weakly prime, because it can be changed into another prime (1538701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 769365 + 769366.

It is an arithmetic number, because the mean of its divisors is an integer number (769366).

2^1538731 is an apocalyptic number.

1538731 is a deficient number, since it is larger than the sum of its proper divisors (1).

1538731 is an equidigital number, since it uses as much as digits as its factorization.

1538731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 28.

The square root of 1538731 is about 1240.4559645550. The cubic root of 1538731 is about 115.4483067965.

The spelling of 1538731 in words is "one million, five hundred thirty-eight thousand, seven hundred thirty-one".