1542721 has 4 divisors (see below), whose sum is σ = 1561392. Its totient is φ = 1524052.

The previous prime is 1542703. The next prime is 1542727. The reversal of 1542721 is 1272451.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 1542721 - 2⁵ = 1542689 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1542692 and 1542701.

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, 9211 + ... + 9376.

It is an arithmetic number, because the mean of its divisors is an integer number (390348).

2^1542721 is an apocalyptic number.

It is an amenable number.

1542721 is a deficient number, since it is larger than the sum of its proper divisors (18671).

1542721 is an equidigital number, since it uses as much as digits as its factorization.

1542721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18670.

The product of its digits is 560, while the sum is 22.

The square root of 1542721 is about 1242.0632029007. The cubic root of 1542721 is about 115.5480082527.

The spelling of 1542721 in words is "one million, five hundred forty-two thousand, seven hundred twenty-one".