1381987965 has 32 divisors (see below), whose sum is σ = 2280554496. Its totient is φ = 714208320.

The previous prime is 1381987951. The next prime is 1381987969. The reversal of 1381987965 is 5697891831.

It is not a de Polignac number, because 1381987965 - 2¹⁶ = 1381922429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381987969) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73480 + ... + 90350.

It is an arithmetic number, because the mean of its divisors is an integer number (71267328).

Almost surely, 2^1381987965 is an apocalyptic number.

1381987965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1381987965 is a deficient number, since it is larger than the sum of its proper divisors (898566531).

1381987965 is a wasteful number, since it uses less digits than its factorization.

1381987965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17049.

The product of its digits is 3265920, while the sum is 57.

The square root of 1381987965 is about 37175.0987221285. The cubic root of 1381987965 is about 1113.8706321563.

The spelling of 1381987965 in words is "one billion, three hundred eighty-one million, nine hundred eighty-seven thousand, nine hundred sixty-five".