1391929 has 8 divisors (see below), whose sum is σ = 1735488. Its totient is φ = 1084560.

The previous prime is 1391927. The next prime is 1391933. The reversal of 1391929 is 9291931.

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 1391929 - 2¹ = 1391927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1391894 and 1391903.

It is not an unprimeable number, because it can be changed into a prime (1391927) 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, 8962 + ... + 9115.

It is an arithmetic number, because the mean of its divisors is an integer number (216936).

2^1391929 is an apocalyptic number.

It is an amenable number.

1391929 is a deficient number, since it is larger than the sum of its proper divisors (343559).

1391929 is a wasteful number, since it uses less digits than its factorization.

1391929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18095.

The product of its digits is 4374, while the sum is 34.

The square root of 1391929 is about 1179.8004068485. The cubic root of 1391929 is about 111.6535050451.

It can be divided in two parts, 13919 and 29, that multiplied together give a triangular number (403651 = T₈₉₈).

The spelling of 1391929 in words is "one million, three hundred ninety-one thousand, nine hundred twenty-nine".