40161825 has 72 divisors (see below), whose sum is σ = 81515616. Its totient is φ = 19440000.

The previous prime is 40161817. The next prime is 40161853. The reversal of 40161825 is 52816104.

40161825 is a `hidden beast` number, since 40 + 1 + 618 + 2 + 5 = 666.

It is not a de Polignac number, because 40161825 - 2³ = 40161817 is a prime.

It is a super-2 number, since 2×40161825² = 3225944374661250, which contains 22 as substring.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 66525 + ... + 67125.

Almost surely, 2^40161825 is an apocalyptic number.

40161825 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40161825 is an abundant number, since it is smaller than the sum of its proper divisors (41353791).

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

40161825 is a wasteful number, since it uses less digits than its factorization.

40161825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637 (or 620 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 40161825 is about 6337.3357966893. The cubic root of 40161825 is about 342.4557635517.

Adding to 40161825 its reverse (52816104), we get a palindrome (92977929).

It can be divided in two parts, 401 and 61825, that added together give a palindrome (62226).

The spelling of 40161825 in words is "forty million, one hundred sixty-one thousand, eight hundred twenty-five".