42455640 has 32 divisors (see below), whose sum is σ = 127367280. Its totient is φ = 11321472.

The previous prime is 42455603. The next prime is 42455641. The reversal of 42455640 is 4655424.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 42455598 and 42455607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42455641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176779 + ... + 177018.

Almost surely, 2^42455640 is an apocalyptic number.

42455640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42455640 is an abundant number, since it is smaller than the sum of its proper divisors (84911640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42455640 is a wasteful number, since it uses less digits than its factorization.

42455640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353811 (or 353807 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 42455640 is about 6515.7992602596. The cubic root of 42455640 is about 348.8551435906.

The spelling of 42455640 in words is "forty-two million, four hundred fifty-five thousand, six hundred forty".