42439390 has 32 divisors (see below), whose sum is σ = 89092800. Its totient is φ = 14549472.

The previous prime is 42439381. The next prime is 42439391. The reversal of 42439390 is 9393424.

42439390 = T₃₁₆ + T₃₁₇ + ... + T₆₅₈.

It is a super-2 number, since 2×42439390² = 3602203647144200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42439391) 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, 2757 + ... + 9616.

It is an arithmetic number, because the mean of its divisors is an integer number (2784150).

Almost surely, 2^42439390 is an apocalyptic number.

42439390 is an abundant number, since it is smaller than the sum of its proper divisors (46653410).

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

42439390 is a wasteful number, since it uses less digits than its factorization.

42439390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12401 (or 12387 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 42439390 is about 6514.5521718688. The cubic root of 42439390 is about 348.8106295245.

The spelling of 42439390 in words is "forty-two million, four hundred thirty-nine thousand, three hundred ninety".