139402439969 has 8 divisors (see below), whose sum is σ = 150129326760. Its totient is φ = 128676070656.

The previous prime is 139402439947. The next prime is 139402439971. The reversal of 139402439969 is 969934204931.

It can be written as a sum of positive squares in 4 ways, for example, as 94342369 + 139308097600 = 9713^2 + 373240^2 .

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 139402439969 - 2⁸ = 139402439713 is a prime.

It is a super-2 number, since 2×139402439969² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139402439909) 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, 570329 + ... + 777225.

It is an arithmetic number, because the mean of its divisors is an integer number (18766165845).

Almost surely, 2^139402439969 is an apocalyptic number.

It is an amenable number.

139402439969 is a deficient number, since it is larger than the sum of its proper divisors (10726886791).

139402439969 is a wasteful number, since it uses less digits than its factorization.

139402439969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258739.

The product of its (nonzero) digits is 11337408, while the sum is 59.

The spelling of 139402439969 in words is "one hundred thirty-nine billion, four hundred two million, four hundred thirty-nine thousand, nine hundred sixty-nine".