155709240 has 64 divisors (see below), whose sum is σ = 469216800. Its totient is φ = 41336832.

The previous prime is 155709221. The next prime is 155709247. The reversal of 155709240 is 42907551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155709247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25176 + ... + 30744.

Almost surely, 2^155709240 is an apocalyptic number.

155709240 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 155709240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234608400).

155709240 is an abundant number, since it is smaller than the sum of its proper divisors (313507560).

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

155709240 is a wasteful number, since it uses less digits than its factorization.

155709240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5816 (or 5812 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 155709240 is about 12478.3508525766. The cubic root of 155709240 is about 537.9866038685.

The spelling of 155709240 in words is "one hundred fifty-five million, seven hundred nine thousand, two hundred forty".