1909897464 has 32 divisors (see below), whose sum is σ = 4805165520. Its totient is φ = 632576256.

The previous prime is 1909897447. The next prime is 1909897469. The reversal of 1909897464 is 4647989091.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1909897469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249669 + ... + 257204.

Almost surely, 2^1909897464 is an apocalyptic number.

It is an amenable number.

1909897464 is an abundant number, since it is smaller than the sum of its proper divisors (2895268056).

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

1909897464 is a wasteful number, since it uses less digits than its factorization.

1909897464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507039 (or 507035 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 57.

The square root of 1909897464 is about 43702.3736655116. The cubic root of 1909897464 is about 1240.7092421939.

The spelling of 1909897464 in words is "one billion, nine hundred nine million, eight hundred ninety-seven thousand, four hundred sixty-four".