157743842 has 4 divisors (see below), whose sum is σ = 236615766. Its totient is φ = 78871920.

The previous prime is 157743829. The next prime is 157743881. The reversal of 157743842 is 248347751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 248347751 = 8699 ⋅28549.

It can be written as a sum of positive squares in only one way, i.e., 97199881 + 60543961 = 9859^2 + 7781^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 157743842.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39435959 + ... + 39435962.

Almost surely, 2^157743842 is an apocalyptic number.

157743842 is a deficient number, since it is larger than the sum of its proper divisors (78871924).

157743842 is an equidigital number, since it uses as much as digits as its factorization.

157743842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78871923.

The product of its digits is 188160, while the sum is 41.

The square root of 157743842 is about 12559.6115385787. The cubic root of 157743842 is about 540.3197032314.

The spelling of 157743842 in words is "one hundred fifty-seven million, seven hundred forty-three thousand, eight hundred forty-two".