1572137421 has 8 divisors (see below), whose sum is σ = 2106824544. Its totient is φ = 1042770960.

The previous prime is 1572137393. The next prime is 1572137431. The reversal of 1572137421 is 1247312751.

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

It is not a de Polignac number, because 1572137421 - 2⁵ = 1572137389 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1572137431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1329475 + ... + 1330656.

It is an arithmetic number, because the mean of its divisors is an integer number (263353068).

Almost surely, 2^1572137421 is an apocalyptic number.

It is an amenable number.

1572137421 is a deficient number, since it is larger than the sum of its proper divisors (534687123).

1572137421 is a wasteful number, since it uses less digits than its factorization.

1572137421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2660331.

The product of its digits is 11760, while the sum is 33.

The square root of 1572137421 is about 39650.1881584438. The cubic root of 1572137421 is about 1162.7780771698.

The spelling of 1572137421 in words is "one billion, five hundred seventy-two million, one hundred thirty-seven thousand, four hundred twenty-one".