40263978420 has 192 divisors, whose sum is σ = 127584334080. Its totient is φ = 10539072000.

The previous prime is 40263978401. The next prime is 40263978437. The reversal of 40263978420 is 2487936204.

40263978420 is a `hidden beast` number, since 4 + 0 + 2 + 639 + 7 + 8 + 4 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 21179470 + ... + 21181370.

It is an arithmetic number, because the mean of its divisors is an integer number (664501740).

Almost surely, 2^40263978420 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 40263978420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63792167040).

40263978420 is an abundant number, since it is smaller than the sum of its proper divisors (87320355660).

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

40263978420 is a wasteful number, since it uses less digits than its factorization.

40263978420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2623 (or 2615 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 40263978420 in words is "forty billion, two hundred sixty-three million, nine hundred seventy-eight thousand, four hundred twenty".