40621429 has 4 divisors (see below), whose sum is σ = 40687884. Its totient is φ = 40554976.

The previous prime is 40621417. The next prime is 40621433. The reversal of 40621429 is 92412604.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2798929 + 37822500 = 1673^2 + 6150^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40621429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40621397 and 40621406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40621729) 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, 32302 + ... + 33535.

It is an arithmetic number, because the mean of its divisors is an integer number (10171971).

Almost surely, 2^40621429 is an apocalyptic number.

It is an amenable number.

40621429 is a deficient number, since it is larger than the sum of its proper divisors (66455).

40621429 is an equidigital number, since it uses as much as digits as its factorization.

40621429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66454.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 40621429 is about 6373.4942535473. The cubic root of 40621429 is about 343.7571439176.

The spelling of 40621429 in words is "forty million, six hundred twenty-one thousand, four hundred twenty-nine".