1394507987 has 4 divisors (see below), whose sum is σ = 1408884456. Its totient is φ = 1380131520.

The previous prime is 1394507951. The next prime is 1394507993. The reversal of 1394507987 is 7897054931.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1394507987 - 2¹⁴ = 1394491603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1394507927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7188089 + ... + 7188282.

It is an arithmetic number, because the mean of its divisors is an integer number (352221114).

Almost surely, 2^1394507987 is an apocalyptic number.

1394507987 is a deficient number, since it is larger than the sum of its proper divisors (14376469).

1394507987 is an equidigital number, since it uses as much as digits as its factorization.

1394507987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14376468.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The square root of 1394507987 is about 37343.1116405690. Note that the first 3 decimals coincide. The cubic root of 1394507987 is about 1117.2242026511.

The spelling of 1394507987 in words is "one billion, three hundred ninety-four million, five hundred seven thousand, nine hundred eighty-seven".