139735988 has 48 divisors (see below), whose sum is σ = 297892224. Its totient is φ = 55987200.

The previous prime is 139735987. The next prime is 139736011. The reversal of 139735988 is 889537931.

It is a happy number.

It is a super-2 number, since 2×139735988² = 39052292684672288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139735987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76688 + ... + 78488.

It is an arithmetic number, because the mean of its divisors is an integer number (6206088).

Almost surely, 2^139735988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139735988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148946112).

139735988 is an abundant number, since it is smaller than the sum of its proper divisors (158156236).

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

139735988 is a wasteful number, since it uses less digits than its factorization.

139735988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992 (or 1990 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 53.

The square root of 139735988 is about 11820.9977582267. The cubic root of 139735988 is about 518.9228046155.

Adding to 139735988 its sum of digits (53), we get a square (139736041 = 11821²).

The spelling of 139735988 in words is "one hundred thirty-nine million, seven hundred thirty-five thousand, nine hundred eighty-eight".