1378490887 has 4 divisors (see below), whose sum is σ = 1379418160. Its totient is φ = 1377563616.

The previous prime is 1378490881. The next prime is 1378490891. The reversal of 1378490887 is 7880948731.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1378490887 - 2³ = 1378490879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1378490881) 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, 461403 + ... + 464380.

It is an arithmetic number, because the mean of its divisors is an integer number (344854540).

Almost surely, 2^1378490887 is an apocalyptic number.

1378490887 is a deficient number, since it is larger than the sum of its proper divisors (927273).

1378490887 is an equidigital number, since it uses as much as digits as its factorization.

1378490887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927272.

The product of its (nonzero) digits is 2709504, while the sum is 55.

The square root of 1378490887 is about 37128.0337076986. The cubic root of 1378490887 is about 1112.9303001015.

The spelling of 1378490887 in words is "one billion, three hundred seventy-eight million, four hundred ninety thousand, eight hundred eighty-seven".