1909420015950 has 192 divisors, whose sum is σ = 5394659719680. Its totient is φ = 496340974080.

The previous prime is 1909420015873. The next prime is 1909420015957. The reversal of 1909420015950 is 595100249091.

1909420015950 is a `hidden beast` number, since 19 + 0 + 9 + 42 + 0 + 0 + 1 + 595 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1909420015896 and 1909420015905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909420015957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 29166454 + ... + 29231846.

It is an arithmetic number, because the mean of its divisors is an integer number (28097186040).

Almost surely, 2^{1909420015950} is an apocalyptic number.

1909420015950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1909420015950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2697329859840).

1909420015950 is an abundant number, since it is smaller than the sum of its proper divisors (3485239703730).

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

1909420015950 is a wasteful number, since it uses less digits than its factorization.

1909420015950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65960 (or 65949 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 45.

The spelling of 1909420015950 in words is "one trillion, nine hundred nine billion, four hundred twenty million, fifteen thousand, nine hundred fifty".