1421761837 has 2 divisors, whose sum is σ = 1421761838. Its totient is φ = 1421761836.

The previous prime is 1421761807. The next prime is 1421761877. The reversal of 1421761837 is 7381671241.

It is a happy number.

It is an a-pointer prime, because the next prime (1421761877) can be obtained adding 1421761837 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1399208836 + 22553001 = 37406^2 + 4749^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421761837 - 2¹⁵ = 1421729069 is a prime.

It is a super-2 number, since 2×1421761837² = 4042813442299229138, 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 1421761837.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421761807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710880918 + 710880919.

It is an arithmetic number, because the mean of its divisors is an integer number (710880919).

Almost surely, 2^1421761837 is an apocalyptic number.

It is an amenable number.

1421761837 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421761837 is an equidigital number, since it uses as much as digits as its factorization.

1421761837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 40.

The square root of 1421761837 is about 37706.2572658703. The cubic root of 1421761837 is about 1124.4555289935.

The spelling of 1421761837 in words is "one billion, four hundred twenty-one million, seven hundred sixty-one thousand, eight hundred thirty-seven".