40421951 has 4 divisors (see below), whose sum is σ = 40489152. Its totient is φ = 40354752.

The previous prime is 40421947. The next prime is 40421957. The reversal of 40421951 is 15912404.

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 40421951 - 2² = 40421947 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 40421951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40421957) 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, 32690 + ... + 33903.

It is an arithmetic number, because the mean of its divisors is an integer number (10122288).

Almost surely, 2^40421951 is an apocalyptic number.

40421951 is a deficient number, since it is larger than the sum of its proper divisors (67201).

40421951 is an equidigital number, since it uses as much as digits as its factorization.

40421951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67200.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 40421951 is about 6357.8259649034. The cubic root of 40421951 is about 343.1935289241.

The spelling of 40421951 in words is "forty million, four hundred twenty-one thousand, nine hundred fifty-one".