1521923 has 4 divisors (see below), whose sum is σ = 1639008. Its totient is φ = 1404840.

The previous prime is 1521913. The next prime is 1521937. The reversal of 1521923 is 3291251.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3291251 = 17 ⋅193603.

It is a cyclic number.

It is not a de Polignac number, because 1521923 - 2⁶ = 1521859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1521913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58523 + ... + 58548.

It is an arithmetic number, because the mean of its divisors is an integer number (409752).

2^1521923 is an apocalyptic number.

1521923 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1521923 is a deficient number, since it is larger than the sum of its proper divisors (117085).

1521923 is a wasteful number, since it uses less digits than its factorization.

1521923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117084.

The product of its digits is 540, while the sum is 23.

The square root of 1521923 is about 1233.6624335692. The cubic root of 1521923 is about 115.0264085539.

The spelling of 1521923 in words is "one million, five hundred twenty-one thousand, nine hundred twenty-three".