40021501 has 4 divisors (see below), whose sum is σ = 43100092. Its totient is φ = 36942912.

The previous prime is 40021489. The next prime is 40021507. The reversal of 40021501 is 10512004.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6497401 + 33524100 = 2549^2 + 5790^2 .

It is a cyclic number.

It is not a de Polignac number, because 40021501 - 2⁵ = 40021469 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 3078577 = 40021501 / (4 + 0 + 0 + 2 + 1 + 5 + 0 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40021507) 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, 1539276 + ... + 1539301.

It is an arithmetic number, because the mean of its divisors is an integer number (10775023).

Almost surely, 2^40021501 is an apocalyptic number.

It is an amenable number.

40021501 is a deficient number, since it is larger than the sum of its proper divisors (3078591).

40021501 is a wasteful number, since it uses less digits than its factorization.

40021501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3078590.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 40021501 is about 6326.2548952757. The cubic root of 40021501 is about 342.0564553474.

Adding to 40021501 its reverse (10512004), we get a palindrome (50533505).

The spelling of 40021501 in words is "forty million, twenty-one thousand, five hundred one".