42191964 has 18 divisors (see below), whose sum is σ = 106652000. Its totient is φ = 14063976.

The previous prime is 42191957. The next prime is 42191983. The reversal of 42191964 is 46919124.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1171999 = 42191964 / (4 + 2 + 1 + 9 + 1 + 9 + 6 + 4).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 585964 + ... + 586035.

Almost surely, 2^42191964 is an apocalyptic number.

It is an amenable number.

42191964 is an abundant number, since it is smaller than the sum of its proper divisors (64460036).

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

42191964 is a wasteful number, since it uses less digits than its factorization.

42191964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172009 (or 1172004 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 42191964 is about 6495.5341581736. The cubic root of 42191964 is about 348.1314406376.

The spelling of 42191964 in words is "forty-two million, one hundred ninety-one thousand, nine hundred sixty-four".