27939915 has 12 divisors (see below), whose sum is σ = 48429264. Its totient is φ = 14901264.

The previous prime is 27939913. The next prime is 27939943. The reversal of 27939915 is 51993972.

It is a happy number.

It is not a de Polignac number, because 27939915 - 2¹ = 27939913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 620887 = 27939915 / (2 + 7 + 9 + 3 + 9 + 9 + 1 + 5).

It is not an unprimeable number, because it can be changed into a prime (27939913) 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, 310399 + ... + 310488.

It is an arithmetic number, because the mean of its divisors is an integer number (4035772).

Almost surely, 2^27939915 is an apocalyptic number.

27939915 is a deficient number, since it is larger than the sum of its proper divisors (20489349).

27939915 is a wasteful number, since it uses less digits than its factorization.

27939915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 620898 (or 620895 counting only the distinct ones).

The product of its digits is 153090, while the sum is 45.

The square root of 27939915 is about 5285.8220741905. The cubic root of 27939915 is about 303.4415351486.

The spelling of 27939915 in words is "twenty-seven million, nine hundred thirty-nine thousand, nine hundred fifteen".