140257402 has 4 divisors (see below), whose sum is σ = 210386106. Its totient is φ = 70128700.

The previous prime is 140257391. The next prime is 140257409. The reversal of 140257402 is 204752041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 204752041 = 13 ⋅15750157.

It can be written as a sum of positive squares in only one way, i.e., 140161921 + 95481 = 11839^2 + 309^2 .

It is not an unprimeable number, because it can be changed into a prime (140257409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35064349 + ... + 35064352.

Almost surely, 2^140257402 is an apocalyptic number.

140257402 is a deficient number, since it is larger than the sum of its proper divisors (70128704).

140257402 is an equidigital number, since it uses as much as digits as its factorization.

140257402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70128703.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 140257402 is about 11843.0317908887. The cubic root of 140257402 is about 519.5674435367.

The spelling of 140257402 in words is "one hundred forty million, two hundred fifty-seven thousand, four hundred two".