157838021 has 8 divisors (see below), whose sum is σ = 172941600. Its totient is φ = 142860240.

The previous prime is 157838003. The next prime is 157838033. The reversal of 157838021 is 120838751.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 157838021 - 2¹⁸ = 157575877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (150838021) 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 7 ways as a sum of consecutive naturals, for example, 28811 + ... + 33848.

It is an arithmetic number, because the mean of its divisors is an integer number (21617700).

Almost surely, 2^157838021 is an apocalyptic number.

157838021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

157838021 is a deficient number, since it is larger than the sum of its proper divisors (15103579).

157838021 is a wasteful number, since it uses less digits than its factorization.

157838021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62899.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 157838021 is about 12563.3602591027. The cubic root of 157838021 is about 540.4272122261.

The spelling of 157838021 in words is "one hundred fifty-seven million, eight hundred thirty-eight thousand, twenty-one".