69409921 has 12 divisors (see below), whose sum is σ = 80904432. Its totient is φ = 59374728.

The previous prime is 69409919. The next prime is 69409939. The reversal of 69409921 is 12990496.

It is not a de Polignac number, because 69409921 - 2¹ = 69409919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (69409121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30406 + ... + 32608.

It is an arithmetic number, because the mean of its divisors is an integer number (6742036).

Almost surely, 2^69409921 is an apocalyptic number.

It is an amenable number.

69409921 is a deficient number, since it is larger than the sum of its proper divisors (11494511).

69409921 is a wasteful number, since it uses less digits than its factorization.

69409921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860 (or 2853 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 69409921 is about 8331.2616691591. The cubic root of 69409921 is about 410.9672207229.

It can be divided in two parts, 6940 and 9921, that added together give a palindrome (16861).

The spelling of 69409921 in words is "sixty-nine million, four hundred nine thousand, nine hundred twenty-one".