139869405 has 48 divisors (see below), whose sum is σ = 262197936. Its totient is φ = 68567040.

The previous prime is 139869397. The next prime is 139869439. The reversal of 139869405 is 504968931.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 15129 + 139854276 = 123^2 + 11826^2 .

It is not a de Polignac number, because 139869405 - 2³ = 139869397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 217885 + ... + 218525.

It is an arithmetic number, because the mean of its divisors is an integer number (5462457).

Almost surely, 2^139869405 is an apocalyptic number.

139869405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

139869405 is a deficient number, since it is larger than the sum of its proper divisors (122328531).

139869405 is a wasteful number, since it uses less digits than its factorization.

139869405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038 (or 1035 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 139869405 is about 11826.6396326260. The cubic root of 139869405 is about 519.0879042971.

The spelling of 139869405 in words is "one hundred thirty-nine million, eight hundred sixty-nine thousand, four hundred five".