1399999987 has 2 divisors, whose sum is σ = 1399999988. Its totient is φ = 1399999986.

The previous prime is 1399999961. The next prime is 1400000023. The reversal of 1399999987 is 7899999931.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1399999987 is a prime.

It is not a weakly prime, because it can be changed into another prime (1399999957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699999993 + 699999994.

It is an arithmetic number, because the mean of its divisors is an integer number (699999994).

Almost surely, 2^1399999987 is an apocalyptic number.

1399999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399999987 is an equidigital number, since it uses as much as digits as its factorization.

1399999987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 89282088, while the sum is 73.

The square root of 1399999987 is about 37416.5736940196. The cubic root of 1399999987 is about 1118.6889386188.

It can be divided in two parts, 13 and 99999987, that added together give a 8-th power (100000000 = 10⁸).

The spelling of 1399999987 in words is "one billion, three hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-seven".