40251965 has 8 divisors (see below), whose sum is σ = 52018008. Its totient is φ = 29724480.

The previous prime is 40251949. The next prime is 40251973. The reversal of 40251965 is 56915204.

It is a happy number.

40251965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 574564 + 39677401 = 758^2 + 6299^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40251965 - 2⁴ = 40251949 is a prime.

It is a super-2 number, since 2×40251965² = 3240441372722450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 309566 + ... + 309695.

It is an arithmetic number, because the mean of its divisors is an integer number (6502251).

Almost surely, 2^40251965 is an apocalyptic number.

It is an amenable number.

40251965 is a deficient number, since it is larger than the sum of its proper divisors (11766043).

40251965 is a wasteful number, since it uses less digits than its factorization.

40251965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619279.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 40251965 is about 6344.4436320295. The cubic root of 40251965 is about 342.7117769589.

The spelling of 40251965 in words is "forty million, two hundred fifty-one thousand, nine hundred sixty-five".