40721403 has 4 divisors (see below), whose sum is σ = 54295208. Its totient is φ = 27147600.

The previous prime is 40721399. The next prime is 40721441. The reversal of 40721403 is 30412704.

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

It is not a de Polignac number, because 40721403 - 2² = 40721399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40721403.

It is not an unprimeable number, because it can be changed into a prime (40721203) 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, 6786898 + ... + 6786903.

It is an arithmetic number, because the mean of its divisors is an integer number (13573802).

Almost surely, 2^40721403 is an apocalyptic number.

40721403 is a deficient number, since it is larger than the sum of its proper divisors (13573805).

40721403 is a wasteful number, since it uses less digits than its factorization.

40721403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13573804.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 40721403 is about 6381.3323843849. The cubic root of 40721403 is about 344.0389214795.

The spelling of 40721403 in words is "forty million, seven hundred twenty-one thousand, four hundred three".