137705840 has 20 divisors (see below), whose sum is σ = 320166264. Its totient is φ = 55082304.

The previous prime is 137705803. The next prime is 137705851. The reversal of 137705840 is 48507731.

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

It is a self number, because there is not a number n which added to its sum of digits gives 137705840.

It is a congruent number.

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, 860582 + ... + 860741.

Almost surely, 2^137705840 is an apocalyptic number.

137705840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

137705840 is an abundant number, since it is smaller than the sum of its proper divisors (182460424).

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

137705840 is a wasteful number, since it uses less digits than its factorization.

137705840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721336 (or 1721330 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 137705840 is about 11734.8131642562. The cubic root of 137705840 is about 516.3974863294.

The spelling of 137705840 in words is "one hundred thirty-seven million, seven hundred five thousand, eight hundred forty".