137720240 has 80 divisors (see below), whose sum is σ = 370476288. Its totient is φ = 46633728.

The previous prime is 137720239. The next prime is 137720257. The reversal of 137720240 is 42027731.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44999 + ... + 47961.

Almost surely, 2^137720240 is an apocalyptic number.

137720240 is a gapful number since it is divisible by the number (10) 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 137720240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185238144).

137720240 is an abundant number, since it is smaller than the sum of its proper divisors (232756048).

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

137720240 is a wasteful number, since it uses less digits than its factorization.

137720240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066 (or 3060 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 137720240 is about 11735.4267071973. The cubic root of 137720240 is about 516.4154857224.

Adding to 137720240 its reverse (42027731), we get a palindrome (179747971).

The spelling of 137720240 in words is "one hundred thirty-seven million, seven hundred twenty thousand, two hundred forty".