340642157 has 4 divisors (see below), whose sum is σ = 343092960. Its totient is φ = 338191356.

The previous prime is 340642153. The next prime is 340642187. The reversal of 340642157 is 751246043.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 340642157 - 2² = 340642153 is a prime.

It is a super-2 number, since 2×340642157² = 232074158251225298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340642151) 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, 1225193 + ... + 1225470.

It is an arithmetic number, because the mean of its divisors is an integer number (85773240).

Almost surely, 2^340642157 is an apocalyptic number.

It is an amenable number.

340642157 is a deficient number, since it is larger than the sum of its proper divisors (2450803).

340642157 is a wasteful number, since it uses less digits than its factorization.

340642157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2450802.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 340642157 is about 18456.4936269054. The cubic root of 340642157 is about 698.3923357333.

The spelling of 340642157 in words is "three hundred forty million, six hundred forty-two thousand, one hundred fifty-seven".