185457421 has 2 divisors, whose sum is σ = 185457422. Its totient is φ = 185457420.

The previous prime is 185457401. The next prime is 185457439. The reversal of 185457421 is 124754581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105801796 + 79655625 = 10286^2 + 8925^2 .

It is a cyclic number.

It is not a de Polignac number, because 185457421 - 2¹⁵ = 185424653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (185457401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92728710 + 92728711.

It is an arithmetic number, because the mean of its divisors is an integer number (92728711).

Almost surely, 2^185457421 is an apocalyptic number.

It is an amenable number.

185457421 is a deficient number, since it is larger than the sum of its proper divisors (1).

185457421 is an equidigital number, since it uses as much as digits as its factorization.

185457421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44800, while the sum is 37.

The square root of 185457421 is about 13618.2752579025. The cubic root of 185457421 is about 570.2711554856.

The spelling of 185457421 in words is "one hundred eighty-five million, four hundred fifty-seven thousand, four hundred twenty-one".