1912537638 has 48 divisors (see below), whose sum is σ = 4786466256. Its totient is φ = 545464320.

The previous prime is 1912537633. The next prime is 1912537639. The reversal of 1912537638 is 8367352191.

1912537638 is a `hidden beast` number, since 1 + 9 + 1 + 2 + 5 + 3 + 7 + 638 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 1912537593 and 1912537602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1912537631) 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, 280731 + ... + 287462.

It is an arithmetic number, because the mean of its divisors is an integer number (99718047).

Almost surely, 2^1912537638 is an apocalyptic number.

1912537638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1912537638 is an abundant number, since it is smaller than the sum of its proper divisors (2873928618).

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

1912537638 is a wasteful number, since it uses less digits than its factorization.

1912537638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568229 (or 568226 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 1912537638 is about 43732.5695334724. The cubic root of 1912537638 is about 1241.2806830007.

It can be divided in two parts, 191253 and 7638, that added together give a palindrome (198891).

The spelling of 1912537638 in words is "one billion, nine hundred twelve million, five hundred thirty-seven thousand, six hundred thirty-eight".