1377989 has 8 divisors (see below), whose sum is σ = 1418208. Its totient is φ = 1338480.

The previous prime is 1377983. The next prime is 1378001. The reversal of 1377989 is 9897731.

1377989 = T₄₆ + T₄₇ + ... + T₂₀₂.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1377989 - 2⁴ = 1377973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1377983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8699 + ... + 8855.

It is an arithmetic number, because the mean of its divisors is an integer number (177276).

2^1377989 is an apocalyptic number.

It is an amenable number.

1377989 is a deficient number, since it is larger than the sum of its proper divisors (40219).

1377989 is a wasteful number, since it uses less digits than its factorization.

1377989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355.

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

The square root of 1377989 is about 1173.8777619497. The cubic root of 1377989 is about 111.2795216860.

The spelling of 1377989 in words is "one million, three hundred seventy-seven thousand, nine hundred eighty-nine".