40069765 has 32 divisors (see below), whose sum is σ = 54933120. Its totient is φ = 27869184.

The previous prime is 40069759. The next prime is 40069807. The reversal of 40069765 is 56796004.

It is a 7-Lehmer number, since φ(40069765) divides (40069765-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 40069765 - 2¹³ = 40061573 is a prime.

It is a congruent number.

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, 69157 + ... + 69733.

It is an arithmetic number, because the mean of its divisors is an integer number (1716660).

Almost surely, 2^40069765 is an apocalyptic number.

40069765 is the 3655-th octagonal number.

It is an amenable number.

40069765 is a deficient number, since it is larger than the sum of its proper divisors (14863355).

40069765 is a wasteful number, since it uses less digits than its factorization.

40069765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 40069765 is about 6330.0683250657. The cubic root of 40069765 is about 342.1939013071.

The spelling of 40069765 in words is "forty million, sixty-nine thousand, seven hundred sixty-five".