139689969 has 32 divisors (see below), whose sum is σ = 203751936. Its totient is φ = 84787200.

The previous prime is 139689961. The next prime is 139689983. The reversal of 139689969 is 969986931.

It is not a de Polignac number, because 139689969 - 2³ = 139689961 is a prime.

It is a super-2 number, since 2×139689969² = 39026574878441922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139689961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 241809 + ... + 242385.

It is an arithmetic number, because the mean of its divisors is an integer number (6367248).

Almost surely, 2^139689969 is an apocalyptic number.

It is an amenable number.

139689969 is a deficient number, since it is larger than the sum of its proper divisors (64061967).

139689969 is a wasteful number, since it uses less digits than its factorization.

139689969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745.

The product of its digits is 5668704, while the sum is 60.

The square root of 139689969 is about 11819.0511040438. The cubic root of 139689969 is about 518.8658330583.

The spelling of 139689969 in words is "one hundred thirty-nine million, six hundred eighty-nine thousand, nine hundred sixty-nine".