37798421 has 2 divisors, whose sum is σ = 37798422. Its totient is φ = 37798420.

The previous prime is 37798417. The next prime is 37798427. The reversal of 37798421 is 12489773.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37075921 + 722500 = 6089^2 + 850^2 .

It is an emirp because it is prime and its reverse (12489773) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 37798421 - 2² = 37798417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37798427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18899210 + 18899211.

It is an arithmetic number, because the mean of its divisors is an integer number (18899211).

Almost surely, 2^37798421 is an apocalyptic number.

It is an amenable number.

37798421 is a deficient number, since it is larger than the sum of its proper divisors (1).

37798421 is an equidigital number, since it uses as much as digits as its factorization.

37798421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 41.

The square root of 37798421 is about 6148.0420460501. The cubic root of 37798421 is about 335.6020095174.

The spelling of 37798421 in words is "thirty-seven million, seven hundred ninety-eight thousand, four hundred twenty-one".