158159440 has 20 divisors (see below), whose sum is σ = 367720884. Its totient is φ = 63263744.

The previous prime is 158159437. The next prime is 158159459. The reversal of 158159440 is 44951851.

It can be written as a sum of positive squares in 2 ways, for example, as 28472896 + 129686544 = 5336^2 + 11388^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×158159440² = 50028816922227200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 158159440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 988417 + ... + 988576.

Almost surely, 2^158159440 is an apocalyptic number.

158159440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

158159440 is an abundant number, since it is smaller than the sum of its proper divisors (209561444).

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

158159440 is a wasteful number, since it uses less digits than its factorization.

158159440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977006 (or 1977000 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 158159440 is about 12576.1456734566. The cubic root of 158159440 is about 540.7938028129.

The spelling of 158159440 in words is "one hundred fifty-eight million, one hundred fifty-nine thousand, four hundred forty".