1381249842 has 32 divisors (see below), whose sum is σ = 3159140352. Its totient is φ = 394393104.

The previous prime is 1381249777. The next prime is 1381249867. The reversal of 1381249842 is 2489421831.

It is a super-2 number, since 2×1381249842² = 3815702252050049928, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1381249794 and 1381249803.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62823 + ... + 81909.

It is an arithmetic number, because the mean of its divisors is an integer number (98723136).

Almost surely, 2^1381249842 is an apocalyptic number.

1381249842 is an abundant number, since it is smaller than the sum of its proper divisors (1777890510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1381249842 is a wasteful number, since it uses less digits than its factorization.

1381249842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20822.

The product of its digits is 110592, while the sum is 42.

The square root of 1381249842 is about 37165.1697426502. The cubic root of 1381249842 is about 1113.6722898717.

The spelling of 1381249842 in words is "one billion, three hundred eighty-one million, two hundred forty-nine thousand, eight hundred forty-two".