90421943 has 4 divisors (see below), whose sum is σ = 91511448. Its totient is φ = 89332440.

The previous prime is 90421939. The next prime is 90421951. The reversal of 90421943 is 34912409.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90421943 - 2² = 90421939 is a prime.

It is a super-2 number, since 2×90421943² = 16352255551790498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90421973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 544628 + ... + 544793.

It is an arithmetic number, because the mean of its divisors is an integer number (22877862).

Almost surely, 2^90421943 is an apocalyptic number.

90421943 is a deficient number, since it is larger than the sum of its proper divisors (1089505).

90421943 is a wasteful number, since it uses less digits than its factorization.

90421943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089504.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 90421943 is about 9509.0453253731. The cubic root of 90421943 is about 448.8397154084.

The spelling of 90421943 in words is "ninety million, four hundred twenty-one thousand, nine hundred forty-three".