40721951 has 8 divisors (see below), whose sum is σ = 41129424. Its totient is φ = 40316800.

The previous prime is 40721929. The next prime is 40721969. The reversal of 40721951 is 15912704.

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

It is a cyclic number.

It is not a de Polignac number, because 40721951 - 2¹⁸ = 40459807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40721971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69080 + ... + 69666.

It is an arithmetic number, because the mean of its divisors is an integer number (5141178).

Almost surely, 2^40721951 is an apocalyptic number.

40721951 is a deficient number, since it is larger than the sum of its proper divisors (407473).

40721951 is a wasteful number, since it uses less digits than its factorization.

40721951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1161.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 40721951 is about 6381.3753219819. The cubic root of 40721951 is about 344.0404647505.

The spelling of 40721951 in words is "forty million, seven hundred twenty-one thousand, nine hundred fifty-one".