1542729 has 4 divisors (see below), whose sum is σ = 2056976. Its totient is φ = 1028484.

The previous prime is 1542727. The next prime is 1542811. The reversal of 1542729 is 9272451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9272451 = 3 ⋅3090817.

It is not a de Polignac number, because 1542729 - 2¹ = 1542727 is a prime.

It is a D-number.

It is a Duffinian number.

1542729 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1542696 and 1542705.

It is not an unprimeable number, because it can be changed into a prime (1542727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257119 + ... + 257124.

It is an arithmetic number, because the mean of its divisors is an integer number (514244).

2^1542729 is an apocalyptic number.

It is an amenable number.

1542729 is a deficient number, since it is larger than the sum of its proper divisors (514247).

1542729 is an equidigital number, since it uses as much as digits as its factorization.

1542729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514246.

The product of its digits is 5040, while the sum is 30.

The square root of 1542729 is about 1242.0664233446. The cubic root of 1542729 is about 115.5482079826.

The spelling of 1542729 in words is "one million, five hundred forty-two thousand, seven hundred twenty-nine".