15138705 has 8 divisors (see below), whose sum is σ = 24221952. Its totient is φ = 8073968.

The previous prime is 15138689. The next prime is 15138707. The reversal of 15138705 is 50783151.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15138705 - 2⁴ = 15138689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15138707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504609 + ... + 504638.

It is an arithmetic number, because the mean of its divisors is an integer number (3027744).

Almost surely, 2^15138705 is an apocalyptic number.

15138705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

15138705 is a deficient number, since it is larger than the sum of its proper divisors (9083247).

15138705 is a wasteful number, since it uses less digits than its factorization.

15138705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009255.

The product of its (nonzero) digits is 4200, while the sum is 30.

The square root of 15138705 is about 3890.8488791008. The cubic root of 15138705 is about 247.3790450712.

The spelling of 15138705 in words is "fifteen million, one hundred thirty-eight thousand, seven hundred five".