40215801 has 4 divisors (see below), whose sum is σ = 53621072. Its totient is φ = 26810532.

The previous prime is 40215797. The next prime is 40215809. The reversal of 40215801 is 10851204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 40215801 - 2² = 40215797 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40215809) 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, 6702631 + ... + 6702636.

It is an arithmetic number, because the mean of its divisors is an integer number (13405268).

Almost surely, 2^40215801 is an apocalyptic number.

It is an amenable number.

40215801 is a deficient number, since it is larger than the sum of its proper divisors (13405271).

40215801 is a wasteful number, since it uses less digits than its factorization.

40215801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13405270.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 40215801 is about 6341.5929386866. The cubic root of 40215801 is about 342.6091108136.

The spelling of 40215801 in words is "forty million, two hundred fifteen thousand, eight hundred one".