137213856 has 144 divisors (see below), whose sum is σ = 427269024. Its totient is φ = 41513472.

The previous prime is 137213833. The next prime is 137213897. The reversal of 137213856 is 658312731.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a self number, because there is not a number n which added to its sum of digits gives 137213856.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 250575 + ... + 251121.

It is an arithmetic number, because the mean of its divisors is an integer number (2967146).

Almost surely, 2^137213856 is an apocalyptic number.

137213856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 137213856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213634512).

137213856 is an abundant number, since it is smaller than the sum of its proper divisors (290055168).

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

137213856 is a wasteful number, since it uses less digits than its factorization.

137213856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 643 (or 632 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 137213856 is about 11713.8318239592. The cubic root of 137213856 is about 515.7817717900.

The spelling of 137213856 in words is "one hundred thirty-seven million, two hundred thirteen thousand, eight hundred fifty-six".