42004557 has 48 divisors (see below), whose sum is σ = 72858240. Its totient is φ = 22813056.

The previous prime is 42004553. The next prime is 42004561. The reversal of 42004557 is 75540024.

42004557 is a `hidden beast` number, since 4 + 200 + 455 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (42004553) and next prime (42004561).

It is not a de Polignac number, because 42004557 - 2² = 42004553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42004557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42004553) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 151503 + ... + 151779.

It is an arithmetic number, because the mean of its divisors is an integer number (1517880).

Almost surely, 2^42004557 is an apocalyptic number.

It is an amenable number.

42004557 is a deficient number, since it is larger than the sum of its proper divisors (30853683).

42004557 is a wasteful number, since it uses less digits than its factorization.

42004557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 42004557 is about 6481.0922690547. The cubic root of 42004557 is about 347.6152356637.

The spelling of 42004557 in words is "forty-two million, four thousand, five hundred fifty-seven".