1520420405 has 32 divisors (see below), whose sum is σ = 2182477824. Its totient is φ = 994188096.

The previous prime is 1520420393. The next prime is 1520420411. The reversal of 1520420405 is 5040240251.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1520420405 - 2²⁸ = 1251984949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

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, 276614 + ... + 282056.

It is an arithmetic number, because the mean of its divisors is an integer number (68202432).

Almost surely, 2^1520420405 is an apocalyptic number.

It is an amenable number.

1520420405 is a deficient number, since it is larger than the sum of its proper divisors (662057419).

1520420405 is a wasteful number, since it uses less digits than its factorization.

1520420405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5825.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 1520420405 is about 38992.5685868474. The cubic root of 1520420405 is about 1149.8854088719.

Adding to 1520420405 its reverse (5040240251), we get a palindrome (6560660656).

The spelling of 1520420405 in words is "one billion, five hundred twenty million, four hundred twenty thousand, four hundred five".