1952400778 has 4 divisors (see below), whose sum is σ = 2928601170. Its totient is φ = 976200388.

The previous prime is 1952400773. The next prime is 1952400817. The reversal of 1952400778 is 8770042591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8770042591 = 19 ⋅461581189.

It can be written as a sum of positive squares in only one way, i.e., 1936616049 + 15784729 = 44007^2 + 3973^2 .

It is not an unprimeable number, because it can be changed into a prime (1952400773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 488100193 + ... + 488100196.

Almost surely, 2^1952400778 is an apocalyptic number.

1952400778 is a deficient number, since it is larger than the sum of its proper divisors (976200392).

1952400778 is an equidigital number, since it uses as much as digits as its factorization.

1952400778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976200391.

The product of its (nonzero) digits is 141120, while the sum is 43.

The square root of 1952400778 is about 44185.9794278683. The cubic root of 1952400778 is about 1249.8454802064.

The spelling of 1952400778 in words is "one billion, nine hundred fifty-two million, four hundred thousand, seven hundred seventy-eight".