742421 has 4 divisors (see below), whose sum is σ = 744192. Its totient is φ = 740652.

The previous prime is 742409. The next prime is 742439. The reversal of 742421 is 124247.

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 a de Polignac number, because none of the positive numbers 2^k-742421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 742393 and 742402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (747421) 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, 140 + ... + 1226.

It is an arithmetic number, because the mean of its divisors is an integer number (186048).

2⁷⁴²⁴²¹ is an apocalyptic number.

It is an amenable number.

742421 is a deficient number, since it is larger than the sum of its proper divisors (1771).

742421 is a wasteful number, since it uses less digits than its factorization.

742421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770.

The product of its digits is 448, while the sum is 20.

The square root of 742421 is about 861.6385553119. The cubic root of 742421 is about 90.5489494361.

Adding to 742421 its reverse (124247), we get a palindrome (866668).

The spelling of 742421 in words is "seven hundred forty-two thousand, four hundred twenty-one", and thus it is an iban number.