7390421 has 4 divisors (see below), whose sum is σ = 7547712. Its totient is φ = 7233132.

The previous prime is 7390391. The next prime is 7390423. The reversal of 7390421 is 1240937.

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: 1240937 = 43 ⋅28859.

It is a cyclic number.

It is not a de Polignac number, because 7390421 - 2¹⁰ = 7389397 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7390423) 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, 78575 + ... + 78668.

It is an arithmetic number, because the mean of its divisors is an integer number (1886928).

Almost surely, 2^7390421 is an apocalyptic number.

It is an amenable number.

7390421 is a deficient number, since it is larger than the sum of its proper divisors (157291).

7390421 is a wasteful number, since it uses less digits than its factorization.

7390421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157290.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 7390421 is about 2718.5328763876. The cubic root of 7390421 is about 194.7853961676.

The spelling of 7390421 in words is "seven million, three hundred ninety thousand, four hundred twenty-one".