42621525 has 48 divisors (see below), whose sum is σ = 78923520. Its totient is φ = 22550400.

The previous prime is 42621457. The next prime is 42621529. The reversal of 42621525 is 52512624.

42621525 is a `hidden beast` number, since 426 + 215 + 25 = 666.

It is not a de Polignac number, because 42621525 - 2⁹ = 42621013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42621529) 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, 157140 + ... + 157410.

It is an arithmetic number, because the mean of its divisors is an integer number (1644240).

Almost surely, 2^42621525 is an apocalyptic number.

42621525 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42621525 is a deficient number, since it is larger than the sum of its proper divisors (36301995).

42621525 is a wasteful number, since it uses less digits than its factorization.

42621525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523 (or 512 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 42621525 is about 6528.5162939216. The cubic root of 42621525 is about 349.3089084139.

The spelling of 42621525 in words is "forty-two million, six hundred twenty-one thousand, five hundred twenty-five".