1542739 has 4 divisors (see below), whose sum is σ = 1683000. Its totient is φ = 1402480.

The previous prime is 1542727. The next prime is 1542811. The reversal of 1542739 is 9372451.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1542739 - 2¹⁵ = 1509971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1542739.

It is not an unprimeable number, because it can be changed into a prime (1542239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70114 + ... + 70135.

It is an arithmetic number, because the mean of its divisors is an integer number (420750).

2^1542739 is an apocalyptic number.

1542739 is a deficient number, since it is larger than the sum of its proper divisors (140261).

1542739 is a wasteful number, since it uses less digits than its factorization.

1542739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140260.

The product of its digits is 7560, while the sum is 31.

The square root of 1542739 is about 1242.0704488877. The cubic root of 1542739 is about 115.5484576440.

The spelling of 1542739 in words is "one million, five hundred forty-two thousand, seven hundred thirty-nine".