1357421 has 4 divisors (see below), whose sum is σ = 1461852. Its totient is φ = 1252992.

The previous prime is 1357361. The next prime is 1357423. The reversal of 1357421 is 1247531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1247531 = 199 ⋅6269.

It can be written as a sum of positive squares in 2 ways, for example, as 212521 + 1144900 = 461^2 + 1070^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1357421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1357423) 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, 52196 + ... + 52221.

It is an arithmetic number, because the mean of its divisors is an integer number (365463).

2^1357421 is an apocalyptic number.

It is an amenable number.

1357421 is a deficient number, since it is larger than the sum of its proper divisors (104431).

1357421 is a wasteful number, since it uses less digits than its factorization.

1357421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104430.

The product of its digits is 840, while the sum is 23.

The square root of 1357421 is about 1165.0841171349. The cubic root of 1357421 is about 110.7230875912.

The spelling of 1357421 in words is "one million, three hundred fifty-seven thousand, four hundred twenty-one".