42194640 has 40 divisors (see below), whose sum is σ = 130804128. Its totient is φ = 11251840.

The previous prime is 42194599. The next prime is 42194641. The reversal of 42194640 is 4649124.

It is a tau number, because it is divible by the number of its divisors (40).

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 = 42194598 and 42194607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42194641) 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, 87666 + ... + 88145.

Almost surely, 2^42194640 is an apocalyptic number.

42194640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

42194640 is an abundant number, since it is smaller than the sum of its proper divisors (88609488).

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

42194640 is a wasteful number, since it uses less digits than its factorization.

42194640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175827 (or 175821 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 42194640 is about 6495.7401425858. The cubic root of 42194640 is about 348.1388004912.

The spelling of 42194640 in words is "forty-two million, one hundred ninety-four thousand, six hundred forty".