1891667340 has 72 divisors (see below), whose sum is σ = 5832157968. Its totient is φ = 496172160.

The previous prime is 1891667293. The next prime is 1891667363. The reversal of 1891667340 is 437661981.

It is a happy number.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75162 + ... + 97121.

It is an arithmetic number, because the mean of its divisors is an integer number (81002194).

Almost surely, 2^1891667340 is an apocalyptic number.

1891667340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1891667340 is an abundant number, since it is smaller than the sum of its proper divisors (3940490628).

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

1891667340 is a wasteful number, since it uses less digits than its factorization.

1891667340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172359 (or 172354 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1891667340 is about 43493.3022429891. The cubic root of 1891667340 is about 1236.7490589447.

The spelling of 1891667340 in words is "one billion, eight hundred ninety-one million, six hundred sixty-seven thousand, three hundred forty".