42397784 has 32 divisors (see below), whose sum is σ = 93396240. Its totient is φ = 17788800.

The previous prime is 42397783. The next prime is 42397829. The reversal of 42397784 is 48779324.

It is a super-2 number, since 2×42397784² = 3595144176221312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42397781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17387 + ... + 19674.

Almost surely, 2^42397784 is an apocalyptic number.

42397784 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

42397784 is an abundant number, since it is smaller than the sum of its proper divisors (50998456).

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

42397784 is a wasteful number, since it uses less digits than its factorization.

42397784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37091 (or 37087 counting only the distinct ones).

The product of its digits is 338688, while the sum is 44.

The square root of 42397784 is about 6511.3580764691. The cubic root of 42397784 is about 348.6966052640.

The spelling of 42397784 in words is "forty-two million, three hundred ninety-seven thousand, seven hundred eighty-four".