1505680138 has 4 divisors (see below), whose sum is σ = 2258520210. Its totient is φ = 752840068.

The previous prime is 1505680133. The next prime is 1505680151. The reversal of 1505680138 is 8310865051.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8310865051 = 31 ⋅268092421.

It can be written as a sum of positive squares in only one way, i.e., 1493590609 + 12089529 = 38647^2 + 3477^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1505680097 and 1505680106.

It is not an unprimeable number, because it can be changed into a prime (1505680133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 376420033 + ... + 376420036.

Almost surely, 2^1505680138 is an apocalyptic number.

1505680138 is a deficient number, since it is larger than the sum of its proper divisors (752840072).

1505680138 is an equidigital number, since it uses as much as digits as its factorization.

1505680138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 752840071.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 1505680138 is about 38803.0944384594. The cubic root of 1505680138 is about 1146.1573413872.

The spelling of 1505680138 in words is "one billion, five hundred five million, six hundred eighty thousand, one hundred thirty-eight".