138787425 has 60 divisors (see below), whose sum is σ = 293838336. Its totient is φ = 63439200.

The previous prime is 138787423. The next prime is 138787487. The reversal of 138787425 is 524787831.

It is not a de Polignac number, because 138787425 - 2¹ = 138787423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (138787421) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 9280 + ... + 19070.

Almost surely, 2^138787425 is an apocalyptic number.

138787425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138787425 is an abundant number, since it is smaller than the sum of its proper divisors (155050911).

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

138787425 is an equidigital number, since it uses as much as digits as its factorization.

138787425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9820 (or 9806 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 138787425 is about 11780.8074850581. The cubic root of 138787425 is about 517.7459448465.

The spelling of 138787425 in words is "one hundred thirty-eight million, seven hundred eighty-seven thousand, four hundred twenty-five".