742021 has 8 divisors (see below), whose sum is σ = 860544. Its totient is φ = 626640.

The previous prime is 742009. The next prime is 742031. The reversal of 742021 is 120247.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 742021 - 2⁹ = 741509 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 741986 and 742004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (742031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250 + ... + 1243.

It is an arithmetic number, because the mean of its divisors is an integer number (107568).

2⁷⁴²⁰²¹ is an apocalyptic number.

742021 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

742021 is a deficient number, since it is larger than the sum of its proper divisors (118523).

742021 is a wasteful number, since it uses less digits than its factorization.

742021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1571.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 742021 is about 861.4064081489. The cubic root of 742021 is about 90.5326845915.

Adding to 742021 its reverse (120247), we get a palindrome (862268).

The spelling of 742021 in words is "seven hundred forty-two thousand, twenty-one", and thus it is an iban number.