139863869 has 8 divisors (see below), whose sum is σ = 143005440. Its totient is φ = 136729296.

The previous prime is 139863863. The next prime is 139863877. The reversal of 139863869 is 968368931.

139863869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 139863869 - 2¹² = 139859773 is a prime.

It is a super-2 number, since 2×139863869² = 39123803703298322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139863869.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139863863) 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, 77552 + ... + 79334.

It is an arithmetic number, because the mean of its divisors is an integer number (17875680).

Almost surely, 2^139863869 is an apocalyptic number.

It is an amenable number.

139863869 is a deficient number, since it is larger than the sum of its proper divisors (3141571).

139863869 is a wasteful number, since it uses less digits than its factorization.

139863869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3499.

The product of its digits is 1679616, while the sum is 53.

The square root of 139863869 is about 11826.4055824244. The cubic root of 139863869 is about 519.0810557454.

The spelling of 139863869 in words is "one hundred thirty-nine million, eight hundred sixty-three thousand, eight hundred sixty-nine".