40377643 has 4 divisors (see below), whose sum is σ = 40399128. Its totient is φ = 40356160.

The previous prime is 40377637. The next prime is 40377647. The reversal of 40377643 is 34677304.

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 40377643 - 2¹³ = 40369451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40377599 and 40377608.

It is not an unprimeable number, because it can be changed into a prime (40377647) 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, 7621 + ... + 11782.

It is an arithmetic number, because the mean of its divisors is an integer number (10099782).

Almost surely, 2^40377643 is an apocalyptic number.

40377643 is a deficient number, since it is larger than the sum of its proper divisors (21485).

40377643 is a wasteful number, since it uses less digits than its factorization.

40377643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21484.

The product of its (nonzero) digits is 42336, while the sum is 34.

The square root of 40377643 is about 6354.3404850543. The cubic root of 40377643 is about 343.0680873597.

The spelling of 40377643 in words is "forty million, three hundred seventy-seven thousand, six hundred forty-three".