1376721243 has 12 divisors (see below), whose sum is σ = 1988990328. Its totient is φ = 917632800.

The previous prime is 1376721179. The next prime is 1376721257. The reversal of 1376721243 is 3421276731.

It is not a de Polignac number, because 1376721243 - 2⁶ = 1376721179 is a prime.

It is a super-2 number, since 2×1376721243² = 3790722761854930098, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1376721198 and 1376721207.

It is not an unprimeable number, because it can be changed into a prime (1376721043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45943 + ... + 69743.

It is an arithmetic number, because the mean of its divisors is an integer number (165749194).

Almost surely, 2^1376721243 is an apocalyptic number.

1376721243 is a deficient number, since it is larger than the sum of its proper divisors (612269085).

1376721243 is a wasteful number, since it uses less digits than its factorization.

1376721243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30234 (or 30231 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 1376721243 is about 37104.1944124920. The cubic root of 1376721243 is about 1112.4538530368.

Adding to 1376721243 its reverse (3421276731), we get a palindrome (4797997974).

The spelling of 1376721243 in words is "one billion, three hundred seventy-six million, seven hundred twenty-one thousand, two hundred forty-three".