42939820 has 48 divisors (see below), whose sum is σ = 112428288. Its totient is φ = 13383360.

The previous prime is 42939797. The next prime is 42939839. The reversal of 42939820 is 2893924.

42939820 = T₁₇₉ + T₁₈₀ + ... + T₆₄₀.

It is a self number, because there is not a number n which added to its sum of digits gives 42939820.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12402 + ... + 15481.

It is an arithmetic number, because the mean of its divisors is an integer number (2342256).

Almost surely, 2^42939820 is an apocalyptic number.

It is an amenable number.

42939820 is an abundant number, since it is smaller than the sum of its proper divisors (69488468).

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

42939820 is a wasteful number, since it uses less digits than its factorization.

42939820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27910 (or 27908 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 42939820 is about 6552.8482356911. The cubic root of 42939820 is about 350.1762921406.

The spelling of 42939820 in words is "forty-two million, nine hundred thirty-nine thousand, eight hundred twenty".