988205638 has 16 divisors (see below), whose sum is σ = 1728640800. Its totient is φ = 423516408.

The previous prime is 988205623. The next prime is 988205671. The reversal of 988205638 is 836502889.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a junction number, because it is equal to n+sod(n) for n = 988205591 and 988205600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 719581 + ... + 720952.

It is an arithmetic number, because the mean of its divisors is an integer number (108040050).

Almost surely, 2^988205638 is an apocalyptic number.

988205638 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

988205638 is a deficient number, since it is larger than the sum of its proper divisors (740435162).

988205638 is a wasteful number, since it uses less digits than its factorization.

988205638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440556 (or 1440542 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 49.

The square root of 988205638 is about 31435.7382289648. The cubic root of 988205638 is about 996.0529875897.

The spelling of 988205638 in words is "nine hundred eighty-eight million, two hundred five thousand, six hundred thirty-eight".