139825405 has 8 divisors (see below), whose sum is σ = 172325592. Its totient is φ = 108836928.

The previous prime is 139825373. The next prime is 139825421. The reversal of 139825405 is 504528931.

139825405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 73582084 + 66243321 = 8578^2 + 8139^2 .

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 139825405 - 2⁵ = 139825373 is a prime.

It is a super-2 number, since 2×139825405² = 39102287766828050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377722 + ... + 378091.

It is an arithmetic number, because the mean of its divisors is an integer number (21540699).

Almost surely, 2^139825405 is an apocalyptic number.

It is an amenable number.

139825405 is a deficient number, since it is larger than the sum of its proper divisors (32500187).

139825405 is an equidigital number, since it uses as much as digits as its factorization.

139825405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755855.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 139825405 is about 11824.7792791240. The cubic root of 139825405 is about 519.0334671761.

The spelling of 139825405 in words is "one hundred thirty-nine million, eight hundred twenty-five thousand, four hundred five".