349865497840 has 20 divisors (see below), whose sum is σ = 813437282664. Its totient is φ = 139946199104.

The previous prime is 349865497837. The next prime is 349865497841. The reversal of 349865497840 is 48794568943.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (349865497841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2186659282 + ... + 2186659441.

Almost surely, 2^349865497840 is an apocalyptic number.

It is an amenable number.

349865497840 is an abundant number, since it is smaller than the sum of its proper divisors (463571784824).

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

349865497840 is a wasteful number, since it uses less digits than its factorization.

349865497840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4373318736 (or 4373318730 counting only the distinct ones).

The product of its (nonzero) digits is 209018880, while the sum is 67.

The spelling of 349865497840 in words is "three hundred forty-nine billion, eight hundred sixty-five million, four hundred ninety-seven thousand, eight hundred forty".