3420157 has 4 divisors (see below), whose sum is σ = 3683260. Its totient is φ = 3157056.

The previous prime is 3420139. The next prime is 3420161. The reversal of 3420157 is 7510243.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1406596 + 2013561 = 1186^2 + 1419^2 .

It is a cyclic number.

It is not a de Polignac number, because 3420157 - 2¹¹ = 3418109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3420107) 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, 131532 + ... + 131557.

It is an arithmetic number, because the mean of its divisors is an integer number (920815).

Almost surely, 2^3420157 is an apocalyptic number.

It is an amenable number.

3420157 is a deficient number, since it is larger than the sum of its proper divisors (263103).

3420157 is a wasteful number, since it uses less digits than its factorization.

3420157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263102.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 3420157 is about 1849.3666483421. The cubic root of 3420157 is about 150.6660309012. Note that the first 3 decimals are identical.

The spelling of 3420157 in words is "three million, four hundred twenty thousand, one hundred fifty-seven".