1642229957 has 4 divisors (see below), whose sum is σ = 1645823916. Its totient is φ = 1638636000.

The previous prime is 1642229921. The next prime is 1642229989. The reversal of 1642229957 is 7599222461.

It is a happy number.

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 757405441 + 884824516 = 27521^2 + 29746^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642229957 - 2¹⁰ = 1642228933 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 (1642229917) 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, 1796294 + ... + 1797207.

It is an arithmetic number, because the mean of its divisors is an integer number (411455979).

Almost surely, 2^1642229957 is an apocalyptic number.

It is an amenable number.

1642229957 is a deficient number, since it is larger than the sum of its proper divisors (3593959).

1642229957 is an equidigital number, since it uses as much as digits as its factorization.

1642229957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593958.

The product of its digits is 544320, while the sum is 47.

The square root of 1642229957 is about 40524.4365414252. The cubic root of 1642229957 is about 1179.8079638177.

The spelling of 1642229957 in words is "one billion, six hundred forty-two million, two hundred twenty-nine thousand, nine hundred fifty-seven".