139920552 has 96 divisors (see below), whose sum is σ = 389525760. Its totient is φ = 45360000.

The previous prime is 139920533. The next prime is 139920553. The reversal of 139920552 is 255029931.

It is a happy number.

139920552 is a `hidden beast` number, since 13 + 9 + 92 + 0 + 552 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (139920553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 516177 + ... + 516447.

It is an arithmetic number, because the mean of its divisors is an integer number (4057560).

Almost surely, 2^139920552 is an apocalyptic number.

139920552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139920552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (194762880).

139920552 is an abundant number, since it is smaller than the sum of its proper divisors (249605208).

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

139920552 is a wasteful number, since it uses less digits than its factorization.

139920552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 448 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 139920552 is about 11828.8017989989. The cubic root of 139920552 is about 519.1511693919.

The spelling of 139920552 in words is "one hundred thirty-nine million, nine hundred twenty thousand, five hundred fifty-two".