157243240 has 128 divisors (see below), whose sum is σ = 464486400. Its totient is φ = 46414080.

The previous prime is 157243223. The next prime is 157243243. The reversal of 157243240 is 42342751.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 157243199 and 157243208.

It is not an unprimeable number, because it can be changed into a prime (157243243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57177 + ... + 59863.

It is an arithmetic number, because the mean of its divisors is an integer number (3628800).

Almost surely, 2^157243240 is an apocalyptic number.

157243240 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 157243240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232243200).

157243240 is an abundant number, since it is smaller than the sum of its proper divisors (307243160).

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

157243240 is a wasteful number, since it uses less digits than its factorization.

157243240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2735 (or 2731 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 157243240 is about 12539.6666622363. Note that the first 5 decimals coincide. The cubic root of 157243240 is about 539.7475271527.

Adding to 157243240 its reverse (42342751), we get a palindrome (199585991).

The spelling of 157243240 in words is "one hundred fifty-seven million, two hundred forty-three thousand, two hundred forty".