40407643 has 4 divisors (see below), whose sum is σ = 41801040. Its totient is φ = 39014248.

The previous prime is 40407641. The next prime is 40407667. The reversal of 40407643 is 34670404.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40407643 - 2¹ = 40407641 is a prime.

It is a super-2 number, since 2×40407643² = 3265555225630898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40407641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696655 + ... + 696712.

It is an arithmetic number, because the mean of its divisors is an integer number (10450260).

Almost surely, 2^40407643 is an apocalyptic number.

40407643 is a deficient number, since it is larger than the sum of its proper divisors (1393397).

40407643 is a wasteful number, since it uses less digits than its factorization.

40407643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393396.

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 40407643 is about 6356.7006379096. The cubic root of 40407643 is about 343.1530311881.

The spelling of 40407643 in words is "forty million, four hundred seven thousand, six hundred forty-three".