1371720 has 128 divisors (see below), whose sum is σ = 4976640. Its totient is φ = 295680.

The previous prime is 1371703. The next prime is 1371731. The reversal of 1371720 is 271731.

1371720 = T₁₆₀ + T₁₆₁ + ... + T₂₃₀.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19285 + ... + 19355.

It is an arithmetic number, because the mean of its divisors is an integer number (38880).

2^1371720 is an apocalyptic number.

1371720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1371720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2488320).

1371720 is an abundant number, since it is smaller than the sum of its proper divisors (3604920).

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

1371720 is a wasteful number, since it uses less digits than its factorization.

1371720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 294, while the sum is 21.

The square root of 1371720 is about 1171.2045081880. The cubic root of 1371720 is about 111.1105140709.

The spelling of 1371720 in words is "one million, three hundred seventy-one thousand, seven hundred twenty".