84154919 has 4 divisors (see below), whose sum is σ = 86207520. Its totient is φ = 82102320.

The previous prime is 84154901. The next prime is 84154921. The reversal of 84154919 is 91945148.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84154919 - 2⁸ = 84154663 is a prime.

It is a super-2 number, since 2×84154919² = 14164100783793122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41), and also a Moran number because the ratio is a prime number: 2052559 = 84154919 / (8 + 4 + 1 + 5 + 4 + 9 + 1 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84154949) 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, 1026239 + ... + 1026320.

It is an arithmetic number, because the mean of its divisors is an integer number (21551880).

Almost surely, 2^84154919 is an apocalyptic number.

84154919 is a deficient number, since it is larger than the sum of its proper divisors (2052601).

84154919 is a wasteful number, since it uses less digits than its factorization.

84154919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052600.

The product of its digits is 51840, while the sum is 41.

The square root of 84154919 is about 9173.5990211040. The cubic root of 84154919 is about 438.2209830591.

The spelling of 84154919 in words is "eighty-four million, one hundred fifty-four thousand, nine hundred nineteen".