901443989 has 8 divisors (see below), whose sum is σ = 964311768. Its totient is φ = 839669760.

The previous prime is 901443979. The next prime is 901444001. The reversal of 901443989 is 989344109.

It can be written as a sum of positive squares in 4 ways, for example, as 250683889 + 650760100 = 15833^2 + 25510^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-901443989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (901443919) 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, 271682 + ... + 274979.

It is an arithmetic number, because the mean of its divisors is an integer number (120538971).

Almost surely, 2^901443989 is an apocalyptic number.

It is an amenable number.

901443989 is a deficient number, since it is larger than the sum of its proper divisors (62867779).

901443989 is a wasteful number, since it uses less digits than its factorization.

901443989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546775.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 901443989 is about 30024.0568378092. The cubic root of 901443989 is about 966.0054627928.

The spelling of 901443989 in words is "nine hundred one million, four hundred forty-three thousand, nine hundred eighty-nine".