1376401989 has 4 divisors (see below), whose sum is σ = 1835202656. Its totient is φ = 917601324.

The previous prime is 1376401927. The next prime is 1376402029. The reversal of 1376401989 is 9891046731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1376401989 - 2¹⁶ = 1376336453 is a prime.

It is a super-2 number, since 2×1376401989² = 3788964870646312242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1376401919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229400329 + ... + 229400334.

It is an arithmetic number, because the mean of its divisors is an integer number (458800664).

Almost surely, 2^1376401989 is an apocalyptic number.

It is an amenable number.

1376401989 is a deficient number, since it is larger than the sum of its proper divisors (458800667).

1376401989 is an equidigital number, since it uses as much as digits as its factorization.

1376401989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458800666.

The product of its (nonzero) digits is 326592, while the sum is 48.

The square root of 1376401989 is about 37099.8920348833. The cubic root of 1376401989 is about 1112.3678557684.

The spelling of 1376401989 in words is "one billion, three hundred seventy-six million, four hundred one thousand, nine hundred eighty-nine".