7421790 has 16 divisors (see below), whose sum is σ = 17812368. Its totient is φ = 1979136.

The previous prime is 7421773. The next prime is 7421797. The reversal of 7421790 is 971247.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 247393 = 7421790 / (7 + 4 + 2 + 1 + 7 + 9 + 0).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7421797) 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, 123667 + ... + 123726.

It is an arithmetic number, because the mean of its divisors is an integer number (1113273).

Almost surely, 2^7421790 is an apocalyptic number.

7421790 is an abundant number, since it is smaller than the sum of its proper divisors (10390578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7421790 is a wasteful number, since it uses less digits than its factorization.

7421790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247403.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 7421790 is about 2724.2962393984. The cubic root of 7421790 is about 195.0605991804.

The spelling of 7421790 in words is "seven million, four hundred twenty-one thousand, seven hundred ninety".