1257432 has 48 divisors (see below), whose sum is σ = 3463320. Its totient is φ = 380160.

The previous prime is 1257409. The next prime is 1257437. The reversal of 1257432 is 2347521.

It is a super-2 number, since 2×1257432² = 3162270469248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257437) 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, 2688 + ... + 3120.

2^1257432 is an apocalyptic number.

1257432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1257432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1731660).

1257432 is an abundant number, since it is smaller than the sum of its proper divisors (2205888).

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

1257432 is a wasteful number, since it uses less digits than its factorization.

1257432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464 (or 449 counting only the distinct ones).

The product of its digits is 1680, while the sum is 24.

The square root of 1257432 is about 1121.3527544890. The cubic root of 1257432 is about 107.9348028996.

It can be divided in two parts, 125 and 7432, that added together give a palindrome (7557).

The spelling of 1257432 in words is "one million, two hundred fifty-seven thousand, four hundred thirty-two".