238902191640 has 512 divisors, whose sum is σ = 962150400000. Its totient is φ = 51508348416.

The previous prime is 238902191639. The next prime is 238902191663. The reversal of 238902191640 is 46191209832.

238902191640 is a `hidden beast` number, since 2 + 389 + 0 + 219 + 16 + 40 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 34326481 + ... + 34333439.

It is an arithmetic number, because the mean of its divisors is an integer number (1879200000).

Almost surely, 2^238902191640 is an apocalyptic number.

238902191640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 238902191640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (481075200000).

238902191640 is an abundant number, since it is smaller than the sum of its proper divisors (723248208360).

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

238902191640 is a wasteful number, since it uses less digits than its factorization.

238902191640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7244 (or 7234 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 238902191640 in words is "two hundred thirty-eight billion, nine hundred two million, one hundred ninety-one thousand, six hundred forty".