1381495988 has 6 divisors (see below), whose sum is σ = 2417617986. Its totient is φ = 690747992.

The previous prime is 1381495963. The next prime is 1381495993. The reversal of 1381495988 is 8895941831.

It can be written as a sum of positive squares in only one way, i.e., 910953124 + 470542864 = 30182^2 + 21692^2 .

It is a super-2 number, since 2×1381495988² = 3817062329720192288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172686995 + ... + 172687002.

It is an arithmetic number, because the mean of its divisors is an integer number (402936331).

Almost surely, 2^1381495988 is an apocalyptic number.

It is an amenable number.

1381495988 is a deficient number, since it is larger than the sum of its proper divisors (1036121998).

1381495988 is a wasteful number, since it uses less digits than its factorization.

1381495988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345374001 (or 345373999 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 56.

The square root of 1381495988 is about 37168.4811096714. The cubic root of 1381495988 is about 1113.7384400325.

The spelling of 1381495988 in words is "one billion, three hundred eighty-one million, four hundred ninety-five thousand, nine hundred eighty-eight".