1381406637 has 16 divisors (see below), whose sum is σ = 1985997440. Its totient is φ = 849051072.

The previous prime is 1381406633. The next prime is 1381406641. The reversal of 1381406637 is 7366041831.

It is an interprime number because it is at equal distance from previous prime (1381406633) and next prime (1381406641).

It is not a de Polignac number, because 1381406637 - 2² = 1381406633 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1381406595 and 1381406604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381406633) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 10968 + ... + 53694.

It is an arithmetic number, because the mean of its divisors is an integer number (124124840).

Almost surely, 2^1381406637 is an apocalyptic number.

It is an amenable number.

1381406637 is a deficient number, since it is larger than the sum of its proper divisors (604590803).

1381406637 is a wasteful number, since it uses less digits than its factorization.

1381406637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43572.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 1381406637 is about 37167.2791175249. The cubic root of 1381406637 is about 1113.7144284321.

The spelling of 1381406637 in words is "one billion, three hundred eighty-one million, four hundred six thousand, six hundred thirty-seven".