42499920 has 80 divisors (see below), whose sum is σ = 133955712. Its totient is φ = 11143680.

The previous prime is 42499907. The next prime is 42499927. The reversal of 42499920 is 2999424.

42499920 is nontrivially palindromic in base 13.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42499927) 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, 13189 + ... + 16091.

Almost surely, 2^42499920 is an apocalyptic number.

42499920 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42499920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66977856).

42499920 is an abundant number, since it is smaller than the sum of its proper divisors (91455792).

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

42499920 is a wasteful number, since it uses less digits than its factorization.

42499920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980 (or 2974 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 42499920 is about 6519.1962694799. The cubic root of 42499920 is about 348.9763833796.

The spelling of 42499920 in words is "forty-two million, four hundred ninety-nine thousand, nine hundred twenty".