40390785 has 16 divisors (see below), whose sum is σ = 71806080. Its totient is φ = 21541680.

The previous prime is 40390747. The next prime is 40390807. The reversal of 40390785 is 58709304.

It is not a de Polignac number, because 40390785 - 2¹⁰ = 40389761 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 149461 + ... + 149730.

It is an arithmetic number, because the mean of its divisors is an integer number (4487880).

Almost surely, 2^40390785 is an apocalyptic number.

40390785 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40390785 is a deficient number, since it is larger than the sum of its proper divisors (31415295).

40390785 is a wasteful number, since it uses less digits than its factorization.

40390785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299205 (or 299199 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 40390785 is about 6355.3744972267. The cubic root of 40390785 is about 343.1053035963.

The spelling of 40390785 in words is "forty million, three hundred ninety thousand, seven hundred eighty-five".