40670021 has 8 divisors (see below), whose sum is σ = 46578624. Its totient is φ = 34786080.

The previous prime is 40670009. The next prime is 40670023. The reversal of 40670021 is 12007604.

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

It is not a de Polignac number, because 40670021 - 2¹⁰ = 40668997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40669975 and 40670002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40670023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2480 + ... + 9353.

It is an arithmetic number, because the mean of its divisors is an integer number (5822328).

Almost surely, 2^40670021 is an apocalyptic number.

It is an amenable number.

40670021 is a deficient number, since it is larger than the sum of its proper divisors (5908603).

40670021 is a wasteful number, since it uses less digits than its factorization.

40670021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12331.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 40670021 is about 6377.3051518647. The cubic root of 40670021 is about 343.8941585550.

Adding to 40670021 its reverse (12007604), we get a palindrome (52677625).

The spelling of 40670021 in words is "forty million, six hundred seventy thousand, twenty-one".