42631640 has 16 divisors (see below), whose sum is σ = 95921280. Its totient is φ = 17052640.

The previous prime is 42631637. The next prime is 42631643. The reversal of 42631640 is 4613624.

42631640 = T₄₇₂ + T₄₇₃ + ... + T₇₁₁.

It is an interprime number because it is at equal distance from previous prime (42631637) and next prime (42631643).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42631643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532856 + ... + 532935.

It is an arithmetic number, because the mean of its divisors is an integer number (5995080).

Almost surely, 2^42631640 is an apocalyptic number.

42631640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42631640 is an abundant number, since it is smaller than the sum of its proper divisors (53289640).

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

42631640 is a wasteful number, since it uses less digits than its factorization.

42631640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065802 (or 1065798 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 42631640 is about 6529.2909262798. The cubic root of 42631640 is about 349.3365390547.

The spelling of 42631640 in words is "forty-two million, six hundred thirty-one thousand, six hundred forty".