139401288 has 48 divisors (see below), whose sum is σ = 406589820. Its totient is φ = 42892416.

The previous prime is 139401281. The next prime is 139401307. The reversal of 139401288 is 882104931.

It can be written as a sum of positive squares in 2 ways, for example, as 103184964 + 36216324 = 10158^2 + 6018^2 .

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 (139401281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73531 + ... + 75402.

Almost surely, 2^139401288 is an apocalyptic number.

139401288 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

139401288 is an abundant number, since it is smaller than the sum of its proper divisors (267188532).

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

139401288 is a wasteful number, since it uses less digits than its factorization.

139401288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148958 (or 148951 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 139401288 is about 11806.8322593319. The cubic root of 139401288 is about 518.5081600163.

The spelling of 139401288 in words is "one hundred thirty-nine million, four hundred one thousand, two hundred eighty-eight".