990389340 has 72 divisors (see below), whose sum is σ = 3055132080. Its totient is φ = 259624704.

The previous prime is 990389339. The next prime is 990389341. The reversal of 990389340 is 43983099.

It is an interprime number because it is at equal distance from previous prime (990389339) and next prime (990389341).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990389341) 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, 36009 + ... + 57248.

It is an arithmetic number, because the mean of its divisors is an integer number (42432390).

Almost surely, 2^990389340 is an apocalyptic number.

990389340 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

990389340 is an abundant number, since it is smaller than the sum of its proper divisors (2064742740).

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

990389340 is a wasteful number, since it uses less digits than its factorization.

990389340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93331 (or 93326 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 990389340 is about 31470.4518556693. The cubic root of 990389340 is about 996.7861287637.

The spelling of 990389340 in words is "nine hundred ninety million, three hundred eighty-nine thousand, three hundred forty".