138319425 has 18 divisors (see below), whose sum is σ = 247745862. Its totient is φ = 73770240.

The previous prime is 138319409. The next prime is 138319457. The reversal of 138319425 is 524913831.

It can be written as a sum of positive squares in 3 ways, for example, as 28132416 + 110187009 = 5304^2 + 10497^2 .

It is not a de Polignac number, because 138319425 - 2⁴ = 138319409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138319425.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 307152 + ... + 307601.

It is an arithmetic number, because the mean of its divisors is an integer number (13763659).

Almost surely, 2^138319425 is an apocalyptic number.

138319425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138319425 is a deficient number, since it is larger than the sum of its proper divisors (109426437).

138319425 is a wasteful number, since it uses less digits than its factorization.

138319425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614769 (or 614761 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 138319425 is about 11760.9278970666. The cubic root of 138319425 is about 517.1633320975.

The spelling of 138319425 in words is "one hundred thirty-eight million, three hundred nineteen thousand, four hundred twenty-five".