898540638 has 16 divisors (see below), whose sum is σ = 1797428880. Its totient is φ = 299455616.

The previous prime is 898540637. The next prime is 898540649. The reversal of 898540638 is 836045898.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (898540637) 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, 29308 + ... + 51536.

It is an arithmetic number, because the mean of its divisors is an integer number (112339305).

Almost surely, 2^898540638 is an apocalyptic number.

898540638 is an abundant number, since it is smaller than the sum of its proper divisors (898888242).

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

898540638 is a wasteful number, since it uses less digits than its factorization.

898540638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28971.

The product of its (nonzero) digits is 1658880, while the sum is 51.

The square root of 898540638 is about 29975.6674321023. The cubic root of 898540638 is about 964.9672509849.

The spelling of 898540638 in words is "eight hundred ninety-eight million, five hundred forty thousand, six hundred thirty-eight".