1377998 has 4 divisors (see below), whose sum is σ = 2067000. Its totient is φ = 688998.

The previous prime is 1377983. The next prime is 1378001. The reversal of 1377998 is 8997731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8997731 = 751 ⋅11981.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344498 + ... + 344501.

It is an arithmetic number, because the mean of its divisors is an integer number (516750).

2^1377998 is an apocalyptic number.

1377998 is a deficient number, since it is larger than the sum of its proper divisors (689002).

1377998 is an equidigital number, since it uses as much as digits as its factorization.

1377998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689001.

The product of its digits is 95256, while the sum is 44.

The square root of 1377998 is about 1173.8815953920. The cubic root of 1377998 is about 111.2797639505.

The spelling of 1377998 in words is "one million, three hundred seventy-seven thousand, nine hundred ninety-eight".