1913520394 has 4 divisors (see below), whose sum is σ = 2870280594. Its totient is φ = 956760196.

The previous prime is 1913520373. The next prime is 1913520421. The reversal of 1913520394 is 4930253191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4930253191 = 937 ⋅5261743.

It can be written as a sum of positive squares in only one way, i.e., 1780418025 + 133102369 = 42195^2 + 11537^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 478380097 + ... + 478380100.

Almost surely, 2^1913520394 is an apocalyptic number.

1913520394 is a deficient number, since it is larger than the sum of its proper divisors (956760200).

1913520394 is an equidigital number, since it uses as much as digits as its factorization.

1913520394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 956760199.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 1913520394 is about 43743.8040641186. The cubic root of 1913520394 is about 1241.4932569705.

The spelling of 1913520394 in words is "one billion, nine hundred thirteen million, five hundred twenty thousand, three hundred ninety-four".