19440157 has 8 divisors (see below), whose sum is σ = 21317472. Its totient is φ = 17581200.

The previous prime is 19440149. The next prime is 19440167. The reversal of 19440157 is 75104491.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19440157 - 2³ = 19440149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19440167) 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, 2319 + ... + 6652.

It is an arithmetic number, because the mean of its divisors is an integer number (2664684).

Almost surely, 2^19440157 is an apocalyptic number.

It is an amenable number.

19440157 is a deficient number, since it is larger than the sum of its proper divisors (1877315).

19440157 is a wasteful number, since it uses less digits than its factorization.

19440157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9179.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 19440157 is about 4409.0993411353. The cubic root of 19440157 is about 268.8850086398.

The spelling of 19440157 in words is "nineteen million, four hundred forty thousand, one hundred fifty-seven".