1642924391 has 4 divisors (see below), whose sum is σ = 1695921984. Its totient is φ = 1589926800.

The previous prime is 1642924373. The next prime is 1642924411. The reversal of 1642924391 is 1934292461.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1642924391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642924321) 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, 26498750 + ... + 26498811.

It is an arithmetic number, because the mean of its divisors is an integer number (423980496).

Almost surely, 2^1642924391 is an apocalyptic number.

1642924391 is a deficient number, since it is larger than the sum of its proper divisors (52997593).

1642924391 is an equidigital number, since it uses as much as digits as its factorization.

1642924391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52997592.

The product of its digits is 93312, while the sum is 41.

The square root of 1642924391 is about 40533.0037253594. The cubic root of 1642924391 is about 1179.9742384015.

The spelling of 1642924391 in words is "one billion, six hundred forty-two million, nine hundred twenty-four thousand, three hundred ninety-one".