157738421 has 2 divisors, whose sum is σ = 157738422. Its totient is φ = 157738420.

The previous prime is 157738409. The next prime is 157738457. The reversal of 157738421 is 124837751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131102500 + 26635921 = 11450^2 + 5161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157738421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157735421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78869210 + 78869211.

It is an arithmetic number, because the mean of its divisors is an integer number (78869211).

Almost surely, 2^157738421 is an apocalyptic number.

It is an amenable number.

157738421 is a deficient number, since it is larger than the sum of its proper divisors (1).

157738421 is an equidigital number, since it uses as much as digits as its factorization.

157738421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47040, while the sum is 38.

The square root of 157738421 is about 12559.3957259097. The cubic root of 157738421 is about 540.3135136466.

The spelling of 157738421 in words is "one hundred fifty-seven million, seven hundred thirty-eight thousand, four hundred twenty-one".