42099420 has 96 divisors (see below), whose sum is σ = 129620736. Its totient is φ = 10124800.

The previous prime is 42099413. The next prime is 42099433. The reversal of 42099420 is 2499024.

It is a super-2 number, since 2×42099420² = 3544722328672800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 149680 + ... + 149960.

It is an arithmetic number, because the mean of its divisors is an integer number (1350216).

Almost surely, 2^42099420 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 42099420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64810368).

42099420 is an abundant number, since it is smaller than the sum of its proper divisors (87521316).

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

42099420 is a wasteful number, since it uses less digits than its factorization.

42099420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531 (or 529 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 42099420 is about 6488.4065840544. The cubic root of 42099420 is about 347.8767234115.

The spelling of 42099420 in words is "forty-two million, ninety-nine thousand, four hundred twenty".