42621457 has 2 divisors, whose sum is σ = 42621458. Its totient is φ = 42621456.

The previous prime is 42621451. The next prime is 42621529. The reversal of 42621457 is 75412624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40972801 + 1648656 = 6401^2 + 1284^2 .

It is a cyclic number.

It is not a de Polignac number, because 42621457 - 2¹⁹ = 42097169 is a prime.

It is not a weakly prime, because it can be changed into another prime (42621451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21310728 + 21310729.

It is an arithmetic number, because the mean of its divisors is an integer number (21310729).

Almost surely, 2^42621457 is an apocalyptic number.

It is an amenable number.

42621457 is a deficient number, since it is larger than the sum of its proper divisors (1).

42621457 is an equidigital number, since it uses as much as digits as its factorization.

42621457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 31.

The square root of 42621457 is about 6528.5110859981. The cubic root of 42621457 is about 349.3087226469.

The spelling of 42621457 in words is "forty-two million, six hundred twenty-one thousand, four hundred fifty-seven".