40278420 has 144 divisors (see below), whose sum is σ = 150433920. Its totient is φ = 8494848.

The previous prime is 40278409. The next prime is 40278421. The reversal of 40278420 is 2487204.

It is a super-2 number, since 2×40278420² = 3244702235392800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40278421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15151 + ... + 17609.

It is an arithmetic number, because the mean of its divisors is an integer number (1044680).

Almost surely, 2^40278420 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 40278420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75216960).

40278420 is an abundant number, since it is smaller than the sum of its proper divisors (110155500).

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

40278420 is a wasteful number, since it uses less digits than its factorization.

40278420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2494 (or 2489 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 40278420 is about 6346.5281847637. The cubic root of 40278420 is about 342.7868412407.

The spelling of 40278420 in words is "forty million, two hundred seventy-eight thousand, four hundred twenty".