42646940 has 48 divisors (see below), whose sum is σ = 105131712. Its totient is φ = 14224896.

The previous prime is 42646939. The next prime is 42646943. The reversal of 42646940 is 4964624.

It is a super-2 number, since 2×42646940² = 3637522982727200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 42646940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42646943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1064 + ... + 9296.

It is an arithmetic number, because the mean of its divisors is an integer number (2190244).

Almost surely, 2^42646940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42646940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52565856).

42646940 is an abundant number, since it is smaller than the sum of its proper divisors (62484772).

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

42646940 is a wasteful number, since it uses less digits than its factorization.

42646940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8286 (or 8284 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 42646940 is about 6530.4624644814. The cubic root of 42646940 is about 349.3783249972.

The spelling of 42646940 in words is "forty-two million, six hundred forty-six thousand, nine hundred forty".