151640 has 32 divisors (see below), whose sum is σ = 362880. Its totient is φ = 56832.

The previous prime is 151637. The next prime is 151643. The reversal of 151640 is 46151.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (151637) and next prime (151643).

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (151643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 569 + ... + 791.

It is an arithmetic number, because the mean of its divisors is an integer number (11340).

2¹⁵¹⁶⁴⁰ is an apocalyptic number.

151640 is a gapful number since it is divisible by the number (10) 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 151640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181440).

151640 is an abundant number, since it is smaller than the sum of its proper divisors (211240).

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

151640 is a wasteful number, since it uses less digits than its factorization.

151640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 151640 is about 389.4098098405. The cubic root of 151640 is about 53.3258670104.

Adding to 151640 its reverse (46151), we get a palindrome (197791).

The spelling of 151640 in words is "one hundred fifty-one thousand, six hundred forty".