40072621 has 8 divisors (see below), whose sum is σ = 43465464. Its totient is φ = 36794880.

The previous prime is 40072607. The next prime is 40072631. The reversal of 40072621 is 12627004.

It can be written as a sum of positive squares in 4 ways, for example, as 1768900 + 38303721 = 1330^2 + 6189^2 .

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 40072621 - 2⁵ = 40072589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40072592 and 40072601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40072631) 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, 28050 + ... + 29443.

It is an arithmetic number, because the mean of its divisors is an integer number (5433183).

Almost surely, 2^40072621 is an apocalyptic number.

40072621 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

40072621 is a deficient number, since it is larger than the sum of its proper divisors (3392843).

40072621 is a wasteful number, since it uses less digits than its factorization.

40072621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57551.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 40072621 is about 6330.2939110281. The cubic root of 40072621 is about 342.2020311490.

Adding to 40072621 its reverse (12627004), we get a palindrome (52699625).

The spelling of 40072621 in words is "forty million, seventy-two thousand, six hundred twenty-one".