42317640 has 160 divisors (see below), whose sum is σ = 146492280. Its totient is φ = 10948608.

The previous prime is 42317593. The next prime is 42317651. The reversal of 42317640 is 4671324.

42317640 is a `hidden beast` number, since 4 + 2 + 3 + 17 + 640 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 39012516 + 3305124 = 6246^2 + 1818^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 119704 + ... + 120056.

Almost surely, 2^42317640 is an apocalyptic number.

42317640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42317640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73246140).

42317640 is an abundant number, since it is smaller than the sum of its proper divisors (104174640).

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

42317640 is a wasteful number, since it uses less digits than its factorization.

42317640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 42317640 is about 6505.2009961261. The cubic root of 42317640 is about 348.4767544037.

Adding to 42317640 its reverse (4671324), we get a palindrome (46988964).

The spelling of 42317640 in words is "forty-two million, three hundred seventeen thousand, six hundred forty".