1391520 has 96 divisors (see below), whose sum is σ = 4741632. Its totient is φ = 340992.

The previous prime is 1391519. The next prime is 1391521. The reversal of 1391520 is 251931.

It is an interprime number because it is at equal distance from previous prime (1391519) and next prime (1391521).

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6129 + ... + 6351.

It is an arithmetic number, because the mean of its divisors is an integer number (49392).

2^1391520 is an apocalyptic number.

1391520 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 1391520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2370816).

1391520 is an abundant number, since it is smaller than the sum of its proper divisors (3350112).

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

1391520 is a wasteful number, since it uses less digits than its factorization.

1391520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254 (or 246 counting only the distinct ones).

The product of its (nonzero) digits is 270, while the sum is 21.

The square root of 1391520 is about 1179.6270597100. The cubic root of 1391520 is about 111.6425680033.

The spelling of 1391520 in words is "one million, three hundred ninety-one thousand, five hundred twenty".