40391780 has 96 divisors (see below), whose sum is σ = 103299840. Its totient is φ = 13063680.

The previous prime is 40391723. The next prime is 40391801. The reversal of 40391780 is 8719304.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 82697 + ... + 83183.

It is an arithmetic number, because the mean of its divisors is an integer number (1076040).

Almost surely, 2^40391780 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 40391780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51649920).

40391780 is an abundant number, since it is smaller than the sum of its proper divisors (62908060).

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

40391780 is a wasteful number, since it uses less digits than its factorization.

40391780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549 (or 547 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 40391780 is about 6355.4527769467. The cubic root of 40391780 is about 343.1081209631.

The spelling of 40391780 in words is "forty million, three hundred ninety-one thousand, seven hundred eighty".