90443997 has 24 divisors (see below), whose sum is σ = 150710976. Its totient is φ = 51195456.

The previous prime is 90443963. The next prime is 90443999. The reversal of 90443997 is 79934409.

It is not a de Polignac number, because 90443997 - 2⁷ = 90443869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90443999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33 + ... + 13449.

It is an arithmetic number, because the mean of its divisors is an integer number (6279624).

Almost surely, 2^90443997 is an apocalyptic number.

It is an amenable number.

90443997 is a deficient number, since it is larger than the sum of its proper divisors (60266979).

90443997 is a wasteful number, since it uses less digits than its factorization.

90443997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13537 (or 13534 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 90443997 is about 9510.2048873828. The cubic root of 90443997 is about 448.8762032567.

It can be divided in two parts, 9044 and 3997, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 90443997 in words is "ninety million, four hundred forty-three thousand, nine hundred ninety-seven".