1891291416 has 48 divisors (see below), whose sum is σ = 5500187640. Its totient is φ = 540368640.

The previous prime is 1891291411. The next prime is 1891291417. The reversal of 1891291416 is 6141921981.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1891291411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 802945 + ... + 805296.

Almost surely, 2^1891291416 is an apocalyptic number.

It is an amenable number.

1891291416 is an abundant number, since it is smaller than the sum of its proper divisors (3608896224).

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

1891291416 is a wasteful number, since it uses less digits than its factorization.

1891291416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1608264 (or 1608253 counting only the distinct ones).

The product of its digits is 31104, while the sum is 42.

The square root of 1891291416 is about 43488.9803973374. The cubic root of 1891291416 is about 1236.6671286735.

The spelling of 1891291416 in words is "one billion, eight hundred ninety-one million, two hundred ninety-one thousand, four hundred sixteen".