420741557 has 4 divisors (see below), whose sum is σ = 420782796. Its totient is φ = 420700320.

The previous prime is 420741539. The next prime is 420741569. The reversal of 420741557 is 755147024.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 319658641 + 101082916 = 17879^2 + 10054^2 .

It is a cyclic number.

It is not a de Polignac number, because 420741557 - 2¹² = 420737461 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 (420741577) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7163 + ... + 29879.

It is an arithmetic number, because the mean of its divisors is an integer number (105195699).

Almost surely, 2^420741557 is an apocalyptic number.

It is an amenable number.

420741557 is a deficient number, since it is larger than the sum of its proper divisors (41239).

420741557 is a wasteful number, since it uses less digits than its factorization.

420741557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41238.

The product of its (nonzero) digits is 39200, while the sum is 35.

The square root of 420741557 is about 20511.9856912977. The cubic root of 420741557 is about 749.3277276540.

The spelling of 420741557 in words is "four hundred twenty million, seven hundred forty-one thousand, five hundred fifty-seven".