1957652421 has 4 divisors (see below), whose sum is σ = 2610203232. Its totient is φ = 1305101612.

The previous prime is 1957652407. The next prime is 1957652483. The reversal of 1957652421 is 1242567591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1242567591 = 3 ⋅414189197.

It is a cyclic number.

It is not a de Polignac number, because 1957652421 - 2¹³ = 1957644229 is a prime.

It is a super-2 number, since 2×1957652421² = 7664806002894322482, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1957652491) 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 3 ways as a sum of consecutive naturals, for example, 326275401 + ... + 326275406.

It is an arithmetic number, because the mean of its divisors is an integer number (652550808).

Almost surely, 2^1957652421 is an apocalyptic number.

It is an amenable number.

1957652421 is a deficient number, since it is larger than the sum of its proper divisors (652550811).

1957652421 is an equidigital number, since it uses as much as digits as its factorization.

1957652421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652550810.

The product of its digits is 151200, while the sum is 42.

The square root of 1957652421 is about 44245.3660963496. The cubic root of 1957652421 is about 1250.9651044802.

The spelling of 1957652421 in words is "one billion, nine hundred fifty-seven million, six hundred fifty-two thousand, four hundred twenty-one".