7421990 has 8 divisors (see below), whose sum is σ = 13359600. Its totient is φ = 2968792.

The previous prime is 7421987. The next prime is 7421993. The reversal of 7421990 is 991247.

It is an interprime number because it is at equal distance from previous prime (7421987) and next prime (7421993).

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7421993) 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, 371090 + ... + 371109.

It is an arithmetic number, because the mean of its divisors is an integer number (1669950).

Almost surely, 2^7421990 is an apocalyptic number.

7421990 is a deficient number, since it is larger than the sum of its proper divisors (5937610).

7421990 is a wasteful number, since it uses less digits than its factorization.

7421990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742206.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 7421990 is about 2724.3329458787. The cubic root of 7421990 is about 195.0623513080.

The spelling of 7421990 in words is "seven million, four hundred twenty-one thousand, nine hundred ninety".