2157534 has 24 divisors (see below), whose sum is σ = 4747080. Its totient is φ = 708048.

The previous prime is 2157527. The next prime is 2157539. The reversal of 2157534 is 4357512.

It is a happy number.

It is a super-2 number, since 2×2157534² = 9309905922312, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2157498 and 2157507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2157539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 312 + ... + 2100.

It is an arithmetic number, because the mean of its divisors is an integer number (197795).

2^2157534 is an apocalyptic number.

2157534 is an abundant number, since it is smaller than the sum of its proper divisors (2589546).

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

2157534 is a wasteful number, since it uses less digits than its factorization.

2157534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1864 (or 1861 counting only the distinct ones).

The product of its digits is 4200, while the sum is 27.

The square root of 2157534 is about 1468.8546558458. The cubic root of 2157534 is about 129.2168697440.

It can be divided in two parts, 21575 and 34, that added together give a square (21609 = 147²).

The spelling of 2157534 in words is "two million, one hundred fifty-seven thousand, five hundred thirty-four".