1537223478 has 64 divisors (see below), whose sum is σ = 3578884608. Its totient is φ = 431101440.

The previous prime is 1537223447. The next prime is 1537223483. The reversal of 1537223478 is 8743227351.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 947508 + ... + 949128.

It is an arithmetic number, because the mean of its divisors is an integer number (55920072).

Almost surely, 2^1537223478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1537223478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1789442304).

1537223478 is an abundant number, since it is smaller than the sum of its proper divisors (2041661130).

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

1537223478 is a wasteful number, since it uses less digits than its factorization.

1537223478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2037.

The product of its digits is 282240, while the sum is 42.

The square root of 1537223478 is about 39207.4416150812. The cubic root of 1537223478 is about 1154.1059222729.

The spelling of 1537223478 in words is "one billion, five hundred thirty-seven million, two hundred twenty-three thousand, four hundred seventy-eight".