642001493 has 16 divisors (see below), whose sum is σ = 761932416. Its totient is φ = 529493760.

The previous prime is 642001489. The next prime is 642001511. The reversal of 642001493 is 394100246.

It is a cyclic number.

It is not a de Polignac number, because 642001493 - 2² = 642001489 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642001403) 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, 5630 + ... + 36272.

It is an arithmetic number, because the mean of its divisors is an integer number (47620776).

Almost surely, 2^642001493 is an apocalyptic number.

It is an amenable number.

642001493 is a deficient number, since it is larger than the sum of its proper divisors (119930923).

642001493 is a wasteful number, since it uses less digits than its factorization.

642001493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30764.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 642001493 is about 25337.7483806277. The cubic root of 642001493 is about 862.6712923951.

The spelling of 642001493 in words is "six hundred forty-two million, one thousand, four hundred ninety-three".