157817540 has 24 divisors (see below), whose sum is σ = 338470272. Its totient is φ = 61783520.

The previous prime is 157817531. The next prime is 157817549. The reversal of 157817540 is 45718751.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (157817531) and next prime (157817549).

It is a junction number, because it is equal to n+sod(n) for n = 157817494 and 157817503.

It is not an unprimeable number, because it can be changed into a prime (157817549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83006 + ... + 84885.

It is an arithmetic number, because the mean of its divisors is an integer number (14102928).

Almost surely, 2^157817540 is an apocalyptic number.

157817540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

157817540 is an abundant number, since it is smaller than the sum of its proper divisors (180652732).

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

157817540 is a wasteful number, since it uses less digits than its factorization.

157817540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167947 (or 167945 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 38.

The square root of 157817540 is about 12562.5451242971. The cubic root of 157817540 is about 540.4038360069.

The spelling of 157817540 in words is "one hundred fifty-seven million, eight hundred seventeen thousand, five hundred forty".