157821454 has 12 divisors (see below), whose sum is σ = 275382504. Its totient is φ = 67637724.

The previous prime is 157821431. The next prime is 157821463. The reversal of 157821454 is 454128751.

157821454 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×157821454² = 49815222685348232, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 805114 + ... + 805309.

It is an arithmetic number, because the mean of its divisors is an integer number (22948542).

Almost surely, 2^157821454 is an apocalyptic number.

157821454 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

157821454 is a deficient number, since it is larger than the sum of its proper divisors (117561050).

157821454 is a wasteful number, since it uses less digits than its factorization.

157821454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610439 (or 1610432 counting only the distinct ones).

The product of its digits is 44800, while the sum is 37.

The square root of 157821454 is about 12562.7009038662. The cubic root of 157821454 is about 540.4083034510.

It can be divided in two parts, 1578 and 21454, that added together give a palindrome (23032).

The spelling of 157821454 in words is "one hundred fifty-seven million, eight hundred twenty-one thousand, four hundred fifty-four".