157797444 has 108 divisors (see below), whose sum is σ = 443885904. Its totient is φ = 43479072.

The previous prime is 157797443. The next prime is 157797463. The reversal of 157797444 is 444797751.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 157797393 and 157797402.

It is not an unprimeable number, because it can be changed into a prime (157797443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1997397 + ... + 1997475.

Almost surely, 2^157797444 is an apocalyptic number.

157797444 is a gapful number since it is divisible by the number (14) 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 157797444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221942952).

157797444 is an abundant number, since it is smaller than the sum of its proper divisors (286088460).

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

157797444 is a wasteful number, since it uses less digits than its factorization.

157797444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222 (or 134 counting only the distinct ones).

The product of its digits is 987840, while the sum is 48.

The square root of 157797444 is about 12561.7452609102. The cubic root of 157797444 is about 540.3808972459.

The spelling of 157797444 in words is "one hundred fifty-seven million, seven hundred ninety-seven thousand, four hundred forty-four".