139679478 has 20 divisors (see below), whose sum is σ = 312985860. Its totient is φ = 46559772.

The previous prime is 139679471. The next prime is 139679479. The reversal of 139679478 is 874976931.

It is a happy number.

139679478 is a `hidden beast` number, since 13 + 96 + 79 + 478 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139679471) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 430948 + ... + 431271.

It is an arithmetic number, because the mean of its divisors is an integer number (15649293).

Almost surely, 2^139679478 is an apocalyptic number.

139679478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

139679478 is an abundant number, since it is smaller than the sum of its proper divisors (173306382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139679478 is an equidigital number, since it uses as much as digits as its factorization.

139679478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862233 (or 862224 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 139679478 is about 11818.6072783556. The cubic root of 139679478 is about 518.8528434409.

The spelling of 139679478 in words is "one hundred thirty-nine million, six hundred seventy-nine thousand, four hundred seventy-eight".