420001537 has 4 divisors (see below), whose sum is σ = 420265476. Its totient is φ = 419737600.

The previous prime is 420001523. The next prime is 420001559. The reversal of 420001537 is 735100024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 363436096 + 56565441 = 19064^2 + 7521^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420001537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420002537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129568 + ... + 132769.

It is an arithmetic number, because the mean of its divisors is an integer number (105066369).

Almost surely, 2^420001537 is an apocalyptic number.

It is an amenable number.

420001537 is a deficient number, since it is larger than the sum of its proper divisors (263939).

420001537 is a wasteful number, since it uses less digits than its factorization.

420001537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263938.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 420001537 is about 20493.9390308452. The cubic root of 420001537 is about 748.8881522443. Note that the first 3 decimals are identical.

The spelling of 420001537 in words is "four hundred twenty million, one thousand, five hundred thirty-seven".