1908064440 has 48 divisors (see below), whose sum is σ = 6201210600. Its totient is φ = 508817088.

The previous prime is 1908064439. The next prime is 1908064447. The reversal of 1908064440 is 444608091.

It is a happy number.

1908064440 is a `hidden beast` number, since 1 + 9 + 0 + 8 + 0 + 644 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1908064395 and 1908064404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1908064447) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2649730 + ... + 2650449.

Almost surely, 2^1908064440 is an apocalyptic number.

1908064440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1908064440 is an abundant number, since it is smaller than the sum of its proper divisors (4293146160).

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

1908064440 is a wasteful number, since it uses less digits than its factorization.

1908064440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5300196 (or 5300189 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 1908064440 is about 43681.3969556835. The cubic root of 1908064440 is about 1240.3121915984.

The spelling of 1908064440 in words is "one billion, nine hundred eight million, sixty-four thousand, four hundred forty".