42997878 has 112 divisors (see below), whose sum is σ = 120877056. Its totient is φ = 11139120.

The previous prime is 42997859. The next prime is 42997897. The reversal of 42997878 is 87879924.

It is an interprime number because it is at equal distance from previous prime (42997859) and next prime (42997897).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 112075 + ... + 112457.

Almost surely, 2^42997878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42997878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60438528).

42997878 is an abundant number, since it is smaller than the sum of its proper divisors (77879178).

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

42997878 is a wasteful number, since it uses less digits than its factorization.

42997878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 406 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 42997878 is about 6557.2767213227. The cubic root of 42997878 is about 350.3340429899.

The spelling of 42997878 in words is "forty-two million, nine hundred ninety-seven thousand, eight hundred seventy-eight".