139477820 has 24 divisors (see below), whose sum is σ = 303004800. Its totient is φ = 53867072.

The previous prime is 139477769. The next prime is 139477831. The reversal of 139477820 is 28774931.

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, 119660 + ... + 120819.

It is an arithmetic number, because the mean of its divisors is an integer number (12625200).

Almost surely, 2^139477820 is an apocalyptic number.

139477820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139477820 is an abundant number, since it is smaller than the sum of its proper divisors (163526980).

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

139477820 is a wasteful number, since it uses less digits than its factorization.

139477820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240517 (or 240515 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 139477820 is about 11810.0728194199. The cubic root of 139477820 is about 518.6030305093.

The spelling of 139477820 in words is "one hundred thirty-nine million, four hundred seventy-seven thousand, eight hundred twenty".