40505751 has 60 divisors (see below), whose sum is σ = 71743320. Its totient is φ = 22576320.

The previous prime is 40505741. The next prime is 40505789. The reversal of 40505751 is 15750504.

40505751 is a `hidden beast` number, since 40 + 50 + 575 + 1 = 666.

It is not a de Polignac number, because 40505751 - 2⁵ = 40505719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40505741) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 150445 + ... + 150713.

It is an arithmetic number, because the mean of its divisors is an integer number (1195722).

Almost surely, 2^40505751 is an apocalyptic number.

40505751 is a deficient number, since it is larger than the sum of its proper divisors (31237569).

40505751 is a wasteful number, since it uses less digits than its factorization.

40505751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318 (or 296 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 40505751 is about 6364.4128558729. The cubic root of 40505751 is about 343.4305269389.

It can be divided in two parts, 4050 and 5751, that added together give a square (9801 = 99²).

The spelling of 40505751 in words is "forty million, five hundred five thousand, seven hundred fifty-one".