40721145 has 8 divisors (see below), whose sum is σ = 65153856. Its totient is φ = 21717936.

The previous prime is 40721089. The next prime is 40721167. The reversal of 40721145 is 54112704.

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

It is not a de Polignac number, because 40721145 - 2⁶ = 40721081 is a prime.

It is a super-2 number, since 2×40721145² = 3316423300222050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1357357 + ... + 1357386.

It is an arithmetic number, because the mean of its divisors is an integer number (8144232).

Almost surely, 2^40721145 is an apocalyptic number.

It is an amenable number.

40721145 is a deficient number, since it is larger than the sum of its proper divisors (24432711).

40721145 is a wasteful number, since it uses less digits than its factorization.

40721145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2714751.

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 40721145 is about 6381.3121691389. The cubic root of 40721145 is about 344.0381948982.

Adding to 40721145 its reverse (54112704), we get a palindrome (94833849).

The spelling of 40721145 in words is "forty million, seven hundred twenty-one thousand, one hundred forty-five".