35729221 has 4 divisors (see below), whose sum is σ = 38977344. Its totient is φ = 32481100.

The previous prime is 35729207. The next prime is 35729231. The reversal of 35729221 is 12292753.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-35729221 is a prime.

It is a super-3 number, since 3×35729221³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (35729201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1624045 + ... + 1624066.

It is an arithmetic number, because the mean of its divisors is an integer number (9744336).

Almost surely, 2^35729221 is an apocalyptic number.

It is an amenable number.

35729221 is a deficient number, since it is larger than the sum of its proper divisors (3248123).

35729221 is a wasteful number, since it uses less digits than its factorization.

35729221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3248122.

The product of its digits is 7560, while the sum is 31.

The square root of 35729221 is about 5977.3924917141. The cubic root of 35729221 is about 329.3627770622.

The spelling of 35729221 in words is "thirty-five million, seven hundred twenty-nine thousand, two hundred twenty-one".