898409640 has 32 divisors (see below), whose sum is σ = 2695229280. Its totient is φ = 239575872.

The previous prime is 898409639. The next prime is 898409641. The reversal of 898409640 is 46904898.

It is an interprime number because it is at equal distance from previous prime (898409639) and next prime (898409641).

It is a self number, because there is not a number n which added to its sum of digits gives 898409640.

It is not an unprimeable number, because it can be changed into a prime (898409641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3743254 + ... + 3743493.

It is an arithmetic number, because the mean of its divisors is an integer number (84225915).

Almost surely, 2^898409640 is an apocalyptic number.

It is an amenable number.

898409640 is an abundant number, since it is smaller than the sum of its proper divisors (1796819640).

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

898409640 is a wasteful number, since it uses less digits than its factorization.

898409640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7486761 (or 7486757 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 48.

The square root of 898409640 is about 29973.4822801756. The cubic root of 898409640 is about 964.9203545997.

The spelling of 898409640 in words is "eight hundred ninety-eight million, four hundred nine thousand, six hundred forty".