1909161740 has 12 divisors (see below), whose sum is σ = 4009239696. Its totient is φ = 763664688.

The previous prime is 1909161703. The next prime is 1909161757. The reversal of 1909161740 is 471619091.

It is a junction number, because it is equal to n+sod(n) for n = 1909161694 and 1909161703.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47729024 + ... + 47729063.

It is an arithmetic number, because the mean of its divisors is an integer number (334103308).

Almost surely, 2^1909161740 is an apocalyptic number.

1909161740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1909161740 is an abundant number, since it is smaller than the sum of its proper divisors (2100077956).

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

1909161740 is a wasteful number, since it uses less digits than its factorization.

1909161740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95458096 (or 95458094 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 1909161740 is about 43693.9554171970. The cubic root of 1909161740 is about 1240.5499078457.

The spelling of 1909161740 in words is "one billion, nine hundred nine million, one hundred sixty-one thousand, seven hundred forty".