42638477 has 6 divisors (see below), whose sum is σ = 49599918. Its totient is φ = 36547224.

The previous prime is 42638471. The next prime is 42638507. The reversal of 42638477 is 77483624.

It can be written as a sum of positive squares in only one way, i.e., 40309801 + 2328676 = 6349^2 + 1526^2 .

It is not a de Polignac number, because 42638477 - 2⁴ = 42638461 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 (42638471) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 435038 + ... + 435135.

It is an arithmetic number, because the mean of its divisors is an integer number (8266653).

Almost surely, 2^42638477 is an apocalyptic number.

It is an amenable number.

42638477 is a deficient number, since it is larger than the sum of its proper divisors (6961441).

42638477 is an equidigital number, since it uses as much as digits as its factorization.

42638477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870187 (or 870180 counting only the distinct ones).

The product of its digits is 225792, while the sum is 41.

The square root of 42638477 is about 6529.8144690336. The cubic root of 42638477 is about 349.3552128710.

The spelling of 42638477 in words is "forty-two million, six hundred thirty-eight thousand, four hundred seventy-seven".