1953638634 has 16 divisors (see below), whose sum is σ = 4112923680. Its totient is φ = 616938480.

The previous prime is 1953638573. The next prime is 1953638639. The reversal of 1953638634 is 4368363591.

It is not an unprimeable number, because it can be changed into a prime (1953638639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8568477 + ... + 8568704.

It is an arithmetic number, because the mean of its divisors is an integer number (257057730).

Almost surely, 2^1953638634 is an apocalyptic number.

1953638634 is an abundant number, since it is smaller than the sum of its proper divisors (2159285046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1953638634 is a wasteful number, since it uses less digits than its factorization.

1953638634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17137205.

The product of its digits is 1399680, while the sum is 48.

The square root of 1953638634 is about 44199.9845475086. The cubic root of 1953638634 is about 1250.1095656493.

The spelling of 1953638634 in words is "one billion, nine hundred fifty-three million, six hundred thirty-eight thousand, six hundred thirty-four".